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GNDU Question Paper-2023
Ba/Bsc 5
th
Semester
BOTANY: Paper-V (B)
(Biochemistry & Biotechnology)
Time Allowed: Three Hours Maximum Marks: 35
Note: Attempt Five questions in all, selecting at least One question from each section.
The Fifth question may be attempted from any section. All questions carry equal marks.
SECTION-A
1. Write a detailed note on the discovery and nomenclature of enzymes.
2. Describe the concept of holoenzyme, apoenzyme and coenzyme.
SECTION-B
3. ATP is known as the biological energy currency. Comment on it.
4. Discuss in detail about the chemiosmotic theory of electron transport mechanism.
SECTION-C
5. Explain the process of biosynthesis of fatty acid with one example.
6. What is ammonium assimilation? Describe the importance of nitrate reductase and its
regulation.
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SECTION-D
7. What are transposable elements? Explain the mechanism of transposition.
8. Write a note on the functional definition and basic aspects of plant tissue culture.
GNDU Answer Paper-2023
Ba/Bsc 5
th
Semester
BOTANY: Paper-V (B)
(Biochemistry & Biotechnology)
Time Allowed: Three Hours Maximum Marks: 35
Note: Attempt Five questions in all, selecting at least One question from each section.
The Fifth question may be attempted from any section. All questions carry equal marks.
SECTION-A
1. Write a detailed note on the discovery and nomenclature of enzymes.
Ans: Introduction to Enzymes
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They
are proteins, and their role is crucial for various biochemical processes, including digestion,
metabolism, and DNA replication. The discovery of enzymes marked a significant milestone
in biochemistry and molecular biology, enhancing our understanding of how life functions at
a molecular level.
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Historical Background of Enzyme Discovery
1. Early Observations:
o The story of enzymes began in the 19th century. In 1833, Anselme Payen, a
French chemist, discovered diastase, an enzyme in malt extract that helps
convert starch into sugar. This was one of the first indications that certain
substances could facilitate chemical reactions without being consumed in the
process.
2. Further Discoveries:
o In the 1850s, scientists like Louis Pasteur conducted experiments showing
that microorganisms were responsible for fermentation, leading to the
realization that enzymes play a vital role in biological processes. Pasteur’s
work laid the foundation for understanding the role of enzymes in
fermentation and metabolism.
3. Identification of Specific Enzymes:
o By the late 19th century, several specific enzymes were identified, including
pepsin (discovered by William Beaumont in 1833) and urease (isolated by
Hermann Emil Fischer in 1890). These discoveries helped establish the idea
that different enzymes catalyze specific reactions.
4. The Term "Enzyme":
o The term “enzyme” was coined in 1867 by Wilhelm Kühne, a German
biochemist. It derives from the Greek word "enzymon," meaning "in yeast,"
as early studies on fermentation involved yeast.
5. Theoretical Developments:
o In the early 20th century, the Lock and Key Model was proposed by Emil
Fischer in 1894, suggesting that enzymes and substrates fit together like a
key in a lock. This model helped explain the specificity of enzyme-substrate
interactions.
Nomenclature of Enzymes
The nomenclature of enzymes is a systematic way to name them based on their structure
and function. Enzymes are classified into different categories, and each enzyme name
typically indicates its substrate and the type of reaction it catalyzes.
1. Classification of Enzymes:
o Enzymes are classified into six major classes based on the type of reaction
they catalyze. This classification system was established by the International
Union of Biochemistry and Molecular Biology (IUBMB). The major classes are:
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o 1. Oxidoreductases: Catalyze oxidation-reduction reactions (e.g.,
dehydrogenases).
o 2. Transferases: Transfer functional groups from one molecule to another
(e.g., kinases).
o 3. Hydrolases: Catalyze the hydrolysis of various bonds (e.g., proteases).
o 4. Lyases: Add or remove groups to form double bonds (e.g., decarboxylases).
o 5. Isomerases: Catalyze the rearrangement of atoms within a molecule (e.g.,
mutases).
o 6. Ligases: Catalyze the joining of two molecules with the use of ATP (e.g.,
DNA ligase).
2. Naming Conventions:
o The naming of enzymes often follows a specific pattern. Generally, the name
consists of three parts:
▪ The substrate: The substance on which the enzyme acts.
▪ The action: A description of what the enzyme does.
▪ The suffix “-ase”: Indicates that it is an enzyme.
o For example, lactase is an enzyme that acts on lactose, breaking it down into
glucose and galactose.
3. Examples of Enzyme Names:
o Amylase: An enzyme that acts on starch (amyl-) and helps convert it into
sugars.
o Lipase: An enzyme that acts on fats (lipids) to break them down into fatty
acids and glycerol.
o Protease: An enzyme that acts on proteins (prote-) to break them down into
amino acids.
4. Enzyme Codes:
o Each enzyme is assigned a unique Enzyme Commission (EC) number. This
number is composed of four parts that indicate the class, subclass, sub-
subclass, and serial number of the enzyme.
o For example, the EC number for lactase is EC 3.2.1.108:
▪ 3: Indicates it is a hydrolase.
▪ 2: Indicates it acts on glycosidic bonds.
▪ 1: Indicates it acts on polysaccharides.
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▪ 108: The unique identifier for lactase.
Mechanism of Enzyme Action
Understanding how enzymes work is essential for grasping their importance in biological
systems. Enzymes lower the activation energy of reactions, making it easier for them to
occur.
1. Active Site:
o Enzymes have a specific region called the active site, where the substrate
binds. The shape and chemical environment of the active site facilitate the
conversion of substrates into products.
2. Enzyme-Substrate Complex:
o When the substrate binds to the active site, an enzyme-substrate complex
forms. This complex stabilizes the transition state, allowing the reaction to
proceed more easily.
3. Product Formation:
o After the reaction occurs, the enzyme releases the products and returns to its
original state, ready to catalyze another reaction.
Factors Affecting Enzyme Activity
Enzyme activity can be influenced by various factors, including:
1. Temperature:
o Enzymes have an optimal temperature range. High temperatures may
denature enzymes, while low temperatures can slow down their activity.
2. pH:
o Each enzyme has an optimal pH range. Deviations from this range can affect
the enzyme's shape and, consequently, its activity.
3. Substrate Concentration:
o Increasing substrate concentration can enhance enzyme activity up to a
certain point, after which the reaction reaches saturation.
4. Inhibitors:
o Certain substances can inhibit enzyme activity. Competitive inhibitors
compete with substrates for the active site, while non-competitive inhibitors
bind to another part of the enzyme, altering its function.
Applications of Enzymes
The understanding of enzymes and their mechanisms has led to numerous applications in
various fields, including:
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1. Medicine:
o Enzymes are used in diagnostic tests (e.g., blood tests to measure liver
function) and as therapeutic agents (e.g., enzymes that help digest food in
patients with pancreatic insufficiency).
2. Industry:
o Enzymes play a vital role in industrial processes such as brewing, baking, and
the production of biofuels. They are used to improve efficiency and reduce
energy consumption.
3. Biotechnology:
o Enzymes are essential tools in molecular biology techniques, such as PCR
(Polymerase Chain Reaction), which is used to amplify DNA.
4. Food Production:
o Enzymes are used in food processing to enhance flavors, improve texture,
and extend shelf life.
Conclusion
The discovery and nomenclature of enzymes have profoundly influenced our understanding
of biological processes. From their initial identification to the systematic classification and
naming conventions, enzymes have become central to biochemistry and molecular biology.
Their importance extends beyond basic science into medicine, industry, and biotechnology,
highlighting their crucial role in life and various applications that benefit humanity.
Understanding enzymes is not only essential for students of biology but also for anyone
interested in the intricate workings of life itself.
2. Describe the concept of holoenzyme, apoenzyme and coenzyme.
Ans: Understanding Holoenzyme, Apoenzyme, and Coenzyme
Introduction
Enzymes are vital biological molecules that act as catalysts, speeding up chemical reactions
in living organisms. They play crucial roles in various biochemical processes, including
digestion, metabolism, and DNA replication. To fully grasp the concept of enzymes, it's
essential to understand the terms holoenzyme, apoenzyme, and coenzyme. In this
explanation, we will break down these concepts in simple terms, making it easy to
understand how they relate to enzymes and their functions.
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1. What is an Enzyme?
Before delving into holoenzymes, apoenzymes, and coenzymes, let's start with a basic
understanding of enzymes.
• Definition: An enzyme is a protein (or RNA) that facilitates biochemical reactions by
lowering the activation energy required for the reaction to occur.
• Function: Enzymes bind to specific molecules called substrates and convert them
into products through a series of chemical transformations.
• Specificity: Each enzyme is specific to a particular substrate, meaning it only
catalyzes specific reactions.
2. Enzyme Structure
Enzymes consist of long chains of amino acids folded into complex three-dimensional
shapes. This structure is crucial for their function because the shape determines how the
enzyme interacts with its substrate.
3. Understanding Holoenzymes
3.1 Definition of Holoenzyme
• Holoenzyme: A holoenzyme is the complete, active form of an enzyme that includes
both the protein part (apoenzyme) and any non-protein components (cofactors or
coenzymes) that are necessary for its activity.
3.2 Components of a Holoenzyme
1. Apoenzyme: The protein component of the enzyme that requires a cofactor or
coenzyme to become active.
2. Cofactors: Non-protein chemical compounds that assist enzymes in catalyzing
reactions. They can be:
o Metal ions (like zinc, magnesium, iron)
o Organic molecules (known as coenzymes)
3.3 Role of Holoenzymes
• Catalysis: Holoenzymes are responsible for catalyzing specific biochemical reactions
in the body.
• Active Site Formation: The presence of cofactors helps in forming the active site,
which is the specific region where substrates bind.
4. Understanding Apoenzymes
4.1 Definition of Apoenzyme
• Apoenzyme: An apoenzyme is the inactive form of an enzyme, consisting solely of
the protein component without its necessary cofactors or coenzymes.
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4.2 Characteristics of Apoenzymes
1. Inactive: Apoenzymes cannot catalyze reactions by themselves; they require
additional components (cofactors or coenzymes) to become functional.
2. Protein Structure: Apoenzymes maintain their three-dimensional structure, but
without the cofactor, they lack the necessary configuration to bind to substrates
effectively.
4.3 Activation of Apoenzymes
• Activation Mechanism: When an apoenzyme binds to a cofactor or coenzyme, it
undergoes a conformational change, activating it and allowing it to catalyze a
reaction.
5. Understanding Coenzymes
5.1 Definition of Coenzyme
• Coenzyme: Coenzymes are small organic molecules that work alongside enzymes to
enhance their catalytic activity. They are often derived from vitamins.
5.2 Characteristics of Coenzymes
1. Non-Protein Components: Unlike the protein-based apoenzyme, coenzymes are
typically small, organic molecules.
2. Reversible Binding: Coenzymes can bind to and dissociate from enzymes, allowing
them to participate in multiple reactions.
5.3 Examples of Coenzymes
1. NAD+ (Nicotinamide Adenine Dinucleotide): A coenzyme involved in redox reactions
and cellular respiration.
2. FAD (Flavin Adenine Dinucleotide): Another coenzyme that participates in various
metabolic reactions.
3. Coenzyme A: Plays a vital role in the metabolism of fatty acids and the synthesis of
acetylcholine.
6. Interaction between Holoenzymes, Apoenzymes, and Coenzymes
6.1 Formation of Holoenzymes
• The process begins with the apoenzyme, which is inactive on its own. When it binds
to the necessary cofactor (which may be a coenzyme or a metal ion), the complex
becomes a holoenzyme, now capable of catalyzing reactions.
6.2 Importance of Each Component
• Apoenzyme: Provides the specific protein structure that determines the enzyme's
specificity.
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• Cofactor/Coenzyme: Assists in the catalytic process, either by stabilizing the enzyme-
substrate complex or participating directly in the reaction.
7. Examples in Biological Systems
7.1 Example of a Holoenzyme
• DNA Polymerase: This enzyme is essential for DNA replication. The apoenzyme form
requires coenzymes and metal ions (like magnesium) to function effectively, forming
a holoenzyme that can catalyze the addition of nucleotides to a growing DNA strand.
7.2 Example of Apoenzyme Activation
• Pepsin: An enzyme that digests proteins in the stomach is initially produced as an
inactive precursor called pepsinogen (an apoenzyme). It becomes active when it
encounters the acidic environment of the stomach, allowing it to cleave specific
peptide bonds.
8. Importance of Holoenzymes, Apoenzymes, and Coenzymes
• Metabolism: The coordination of holoenzymes and coenzymes is vital for metabolic
pathways. Without the correct coenzymes, reactions would not proceed, leading to
metabolic disorders.
• Nutritional Importance: Many coenzymes are derived from vitamins; thus, a
balanced diet is crucial for providing these essential nutrients.
9. Conclusion
In summary, the concepts of holoenzyme, apoenzyme, and coenzyme are fundamental to
understanding how enzymes work in biological systems. Holoenzymes are the active forms
of enzymes, consisting of both a protein component (apoenzyme) and necessary non-
protein factors (cofactors or coenzymes). Apoenzymes are inactive on their own and require
coenzymes or cofactors to become functional. Coenzymes, often derived from vitamins,
play a crucial role in assisting enzymes in catalyzing biochemical reactions. Together, these
components enable the complex processes that sustain life.
Understanding these concepts not only provides insight into the workings of enzymes but
also highlights the interconnectedness of nutrition, metabolism, and overall health.
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SECTION-B
3. ATP is known as the biological energy currency. Comment on it.
Ans: ATP: The Biological Energy Currency
ATP, or adenosine triphosphate, is a molecule that plays a central role in energy transfer
within living cells. Often referred to as the "energy currency" of the cell, ATP stores and
supplies the energy necessary for numerous biological processes, much like money in an
economy that can be spent on various activities. To understand why ATP is so important and
how it functions as an energy carrier, we need to explore its structure, how it is produced,
and how cells use it.
Structure of ATP
ATP consists of three key components:
1. Adenine – A nitrogenous base (a type of organic molecule).
2. Ribose – A sugar molecule with five carbon atoms.
3. Three phosphate groups – These are linked to each other in a chain.
The energy ATP provides is stored in the bonds between its phosphate groups, particularly
in the bond between the second and third phosphate. When this bond is broken, energy is
released, which can be used to power cellular processes.
ATP as an Energy Carrier
The reason ATP is often called the "energy currency" of the cell is because it can transfer
energy to where it is needed. Just like money, which can be spent on various goods and
services, ATP can be "spent" to perform different functions inside the cell.
For example:
• Muscle contraction: ATP provides the energy that allows muscle fibers to contract
and generate movement.
• Active transport: Cells use ATP to transport substances across cell membranes, even
when they are moving against a concentration gradient (from low to high
concentration).
• Chemical synthesis: ATP powers the construction of molecules like proteins, lipids,
and nucleic acids.
• Cellular communication: ATP is involved in transmitting signals between cells and
within cells, helping them to coordinate their activities.
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ATP Production: How Cells Make ATP
ATP is produced through different processes, depending on the type of organism and the
availability of oxygen. These processes are collectively known as cellular respiration.
1. Glycolysis:
o Occurs in the cytoplasm of the cell.
o Converts one molecule of glucose (a sugar) into two molecules of pyruvate.
o Produces 2 molecules of ATP directly.
2. Krebs Cycle (Citric Acid Cycle):
o Takes place in the mitochondria of eukaryotic cells (more advanced cells with
a nucleus).
o Pyruvate from glycolysis is further broken down.
o Produces high-energy molecules like NADH and FADH₂, which are used in the
next stage.
3. Oxidative Phosphorylation (Electron Transport Chain):
o This is the major ATP production step, also occurring in the mitochondria.
o NADH and FADH₂ transfer electrons through a series of proteins embedded in
the mitochondrial membrane, creating a flow of protons (H⁺) across the
membrane.
o This flow of protons drives the enzyme ATP synthase, which synthesizes ATP
from ADP (adenosine diphosphate) and inorganic phosphate (Pi).
o Produces up to 34 molecules of ATP from a single glucose molecule.
ATP in Photosynthesis (Plants)
In plants, ATP is also produced during photosynthesis in the chloroplasts, which is the
process by which plants convert sunlight into chemical energy. The light-dependent
reactions of photosynthesis generate ATP, which is then used in the Calvin cycle to
synthesize glucose from carbon dioxide.
Why ATP is Called Energy Currency
ATP is the "currency" in biological systems because:
1. Universality: All living organisms use ATP. Whether it’s a human, a plant, a
bacterium, or a fungus, ATP is the molecule that transfers energy for cellular
processes.
2. Efficiency: ATP can be rapidly synthesized and broken down, allowing for quick
energy transfer. The cell can produce ATP as needed, in small or large amounts,
depending on its energy requirements.
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3. Recyclability: ATP is recyclable. When the third phosphate group is removed
(through a process called hydrolysis), ATP becomes ADP. ADP can then be recharged
by adding another phosphate group to form ATP again, making the cycle continuous.
4. Controlled energy release: The breaking of the bond between the second and third
phosphate groups releases energy in a controlled manner, preventing the waste of
energy that could occur if the energy were released all at once.
Uses of ATP in Cellular Processes
ATP is involved in several critical cellular processes. Here are a few key examples:
1. Metabolism:
o ATP is necessary for anabolism (building molecules) and catabolism (breaking
down molecules).
o In anabolic reactions, ATP provides the energy needed to form bonds
between small molecules to create complex molecules like proteins and
nucleic acids.
o In catabolic reactions, ATP is used to help break down larger molecules,
releasing energy for the cell to use.
2. Cellular Transport:
o ATP powers the movement of molecules across the cell membrane. For
example, in active transport, molecules move from areas of lower
concentration to higher concentration, which requires energy.
o One important system that relies on ATP is the sodium-potassium pump,
which maintains the balance of sodium and potassium ions inside and
outside the cell, critical for nerve impulses and muscle contractions.
3. Signal Transduction:
o ATP is used in signal transduction pathways, which are the ways cells
communicate with each other.
o It helps activate protein kinases, enzymes that transfer a phosphate group
from ATP to proteins, activating or deactivating them in response to cellular
signals.
4. DNA and RNA Synthesis:
o The nucleotides that make up DNA and RNA (the genetic material in all living
organisms) are derived from ATP. ATP provides the building blocks for these
critical molecules.
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5. Muscle Contraction:
o In muscles, ATP binds to myosin, one of the proteins involved in muscle
contraction. When ATP is hydrolyzed (broken down), it provides the energy
necessary for the muscle fibers to slide past one another, leading to
contraction.
ATP in Biotechnology
ATP’s central role in cellular processes has made it an important tool in biotechnology and
medical research. Some key applications include:
1. Bioluminescence Assays:
o ATP is involved in producing light in organisms like fireflies. This reaction can
be used in laboratory assays to measure the presence of ATP, which serves as
an indicator of metabolic activity in cells. This is useful in drug testing,
diagnostics, and even environmental monitoring.
2. Energy Production Studies:
o Understanding ATP production helps scientists develop therapies for diseases
like cancer and metabolic disorders, where cellular energy production is
disrupted.
3. Genetic Engineering:
o ATP is used in the laboratory manipulation of DNA and RNA. For example,
DNA ligases, enzymes that join DNA strands together, use ATP to catalyze the
formation of new bonds.
Conclusion
ATP’s role as the biological energy currency is critical for the survival of all living organisms.
It facilitates nearly every process within a cell that requires energy, from muscle
contractions and DNA synthesis to cellular communication and metabolism. The reason ATP
is such a valuable molecule lies in its ability to efficiently store and release energy in a
controlled manner. Furthermore, the universality and recyclability of ATP make it an
essential molecule in both life and biotechnology.
Understanding how ATP functions in cells not only reveals the intricate balance of energy
use and production that sustains life, but also offers valuable insights for fields like medicine
and biotechnology, where manipulating energy flow within cells can have profound
implications for health and disease.
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4. Discuss in detail about the chemiosmotic theory of electron transport mechanism.
Ans: The chemiosmotic theory, proposed by biochemist Peter Mitchell in 1961, explains how ATP
(adenosine triphosphate), the energy currency of the cell, is produced through a process called
oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts. This theory
describes the mechanism by which energy generated from electron transport is used to pump
protons (H⁺ ions) across a membrane, creating a proton gradient. The energy from this gradient is
then harnessed to synthesize ATP.
How the Chemiosmotic Theory Works
1. Electron Transport Chain (ETC):
• In mitochondria, the electron transport chain (ETC) is a series of protein complexes
located in the inner mitochondrial membrane. These proteins pass electrons derived
from nutrients (like glucose) through the chain.
• As electrons move through the ETC, they lose energy, which is used by the chain's
protein complexes to pump protons (H⁺ ions) from the mitochondrial matrix into the
intermembrane space. This creates a higher concentration of protons in the
intermembrane space than in the matrix.
• In chloroplasts, during photosynthesis, a similar electron transport system exists in
the thylakoid membrane, where light energy is used to move electrons and pump
protons into the thylakoid lumen.
2. Proton Gradient and Proton Motive Force:
• This proton pumping results in the formation of a proton gradient, meaning there is
a difference in proton concentration between the two sides of the membrane.
• The energy stored in this gradient, also referred to as the proton motive force (PMF),
is a combination of two factors: the concentration difference (chemical potential) of
protons and the electrical potential due to the separation of charge (since protons
carry a positive charge).
3. ATP Synthesis:
• The key enzyme involved in making ATP is called ATP synthase. ATP synthase is
embedded in the same membrane as the ETC (inner mitochondrial membrane or
thylakoid membrane).
• Protons naturally want to move back into the mitochondrial matrix (or chloroplast
stroma) due to the concentration gradient. However, they can only pass through the
membrane via ATP synthase.
• As protons flow through ATP synthase, the energy from their movement is used to
convert ADP (adenosine diphosphate) into ATP by adding a phosphate group to ADP,
a process called phosphorylation.
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Steps in the Process
1. Electron donors (like NADH and FADH₂) pass electrons to the ETC in the
mitochondria. These electrons move through a series of complexes, releasing
energy.
2. This energy is used to pump protons across the membrane, creating a gradient
(more protons outside the inner mitochondrial membrane than inside).
3. The proton gradient stores potential energy, much like water behind a dam.
4. ATP synthase provides a channel for protons to flow back across the membrane,
using the energy from this flow to convert ADP to ATP.
5. Oxygen acts as the final electron acceptor at the end of the ETC, combining with
electrons and protons to form water.
Importance in Biology
• Chemiosmosis is essential because it links the transfer of electrons (which releases
energy) to the synthesis of ATP. Without this process, cells wouldn't be able to
efficiently generate ATP, which is necessary for almost all cellular functions.
• In plants, the process takes place in chloroplasts during photosynthesis, where light
energy drives the movement of electrons, and ATP is produced to fuel the
conversion of carbon dioxide into sugars.
• In animals and humans, it happens in mitochondria, where the energy from food
molecules is ultimately used to produce ATP.
Real-World Example
Think of a hydroelectric power plant as an analogy. The ETC is like the turbines, and the
proton gradient is like water behind a dam. When the dam releases water, it flows through
the turbines, generating electricity. Similarly, when protons flow back through ATP synthase,
it produces ATP, which powers the cell.
Key Components
1. Proton gradient: Established by pumping protons across the membrane.
2. ATP synthase: The enzyme that synthesizes ATP as protons flow through it.
3. Electron carriers: Molecules like NADH and FADH₂ that donate electrons to the ETC.
4. Final electron acceptor: In respiration, oxygen accepts the electrons and combines
with protons to form water.
Historical Significance
When Peter Mitchell proposed the chemiosmotic theory, it was initially met with skepticism
because most scientists believed that ATP was generated through a high-energy chemical
intermediate. However, over time, more evidence supporting proton pumping by the
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electron transport complexes emerged, leading to widespread acceptance of Mitchell's
theory. He received the Nobel Prize in Chemistry in 1978 for his groundbreaking work.
Conclusion
The chemiosmotic theory is a foundational concept in biology that explains how cells
convert energy from nutrients or sunlight into the usable form of ATP through a proton
gradient. This process is central to both respiration and photosynthesis, making it one of the
most important mechanisms in life. Through the efficient generation of ATP, chemiosmosis
ensures that cells have the energy they need for vital processes like growth, movement, and
reproduction
SECTION-C
5. Explain the process of biosynthesis of fatty acid with one example.
Ans: The biosynthesis of fatty acids is a crucial process in plants, providing energy and essential
structural components for cellular functions. This process primarily takes place in the plastids of
plant cells and involves the conversion of simple molecules into complex fatty acids that are
necessary for the formation of cellular membranes and storage compounds like oils. To understand
the biosynthesis of fatty acids, let's break it down into simpler steps, along with an example that will
help clarify the entire process.
Key Concepts in Fatty Acid Biosynthesis
1. Location: The biosynthesis of fatty acids in plants occurs in plastids, particularly in
chloroplasts for photosynthetic tissues and in leucoplasts for non-photosynthetic
tissues. In plants, the most common fatty acids produced are palmitic acid (16:0) and
stearic acid (18:0) which serve as the precursors for more complex fatty acids.
2. Key Components:
o Acetyl-CoA: The starting molecule for fatty acid biosynthesis. It is derived
from carbohydrates through glycolysis and the tricarboxylic acid (TCA) cycle.
o Malonyl-CoA: This is formed from acetyl-CoA through a carboxylation
reaction and acts as the primary building block for fatty acid chains.
o Fatty Acid Synthase (FAS): A multi-enzyme complex that catalyzes the
synthesis of fatty acids from acetyl-CoA and malonyl-CoA.
Steps of Fatty Acid Biosynthesis
1. Formation of Malonyl-CoA: The first step in the biosynthesis of fatty acids is the
conversion of acetyl-CoA into malonyl-CoA. This is catalyzed by the enzyme acetyl-
CoA carboxylase (ACC), which adds a carbon dioxide molecule to acetyl-CoA.
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2. Initiation of Fatty Acid Chain: The enzyme fatty acid synthase (FAS) initiates the
process by condensing one acetyl group with a malonyl group to form a four-carbon
chain. This is the starting point of the fatty acid chain.
3. Elongation Cycle: The next steps involve repeated cycles of elongation, where two
carbon atoms from malonyl-CoA are added to the growing fatty acid chain. Each
cycle involves the following steps:
o Condensation: Two carbons from malonyl-CoA are added to the growing
chain, releasing a carbon dioxide molecule.
o Reduction: The new carbon chain is reduced using NADPH as an electron
donor.
o Dehydration: A water molecule is removed to create a double bond.
o Second Reduction: The double bond is reduced again using NADPH, resulting
in a saturated fatty acid.
4. Termination: The elongation cycle continues until the fatty acid reaches its final
length (usually 16 or 18 carbons in plants). Once the desired chain length is achieved,
the fatty acid is released from the enzyme complex. In plants, enzymes like
thioesterases play a role in determining the chain length by cleaving the fatty acid
from the enzyme complex.
Example: Palmitic Acid (16:0)
Palmitic acid is a 16-carbon saturated fatty acid that serves as a common example of fatty
acid biosynthesis. Its synthesis involves the repeated addition of two-carbon units from
malonyl-CoA to form a 16-carbon chain. Here’s a simplified outline of how palmitic acid is
synthesized:
• Step 1: Acetyl-CoA is carboxylated to form malonyl-CoA by acetyl-CoA carboxylase.
• Step 2: The acetyl group from acetyl-CoA and a malonyl group from malonyl-CoA are
condensed by fatty acid synthase to initiate the chain.
• Step 3: Through repeated cycles of elongation, the chain grows by two carbon atoms
in each cycle, using NADPH for reduction.
• Step 4: After seven cycles, a 16-carbon chain (palmitic acid) is formed, and the chain
is cleaved from the fatty acid synthase complex by a thioesterase enzyme.
Regulation of Fatty Acid Biosynthesis
The regulation of fatty acid biosynthesis is tightly controlled to ensure a balance between
the production and utilization of fatty acids. Some key factors that regulate this process
include:
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• Energy Levels: The process requires a lot of energy in the form of ATP and reducing
power in the form of NADPH, which is primarily generated through the pentose
phosphate pathway and photosynthesis in plants(
• Feedback Inhibition: The final products of fatty acid synthesis, such as long-chain
fatty acids, can inhibit key enzymes in the pathway to prevent overproduction. For
example, high levels of fatty acids inhibit acetyl-CoA carboxylase, the enzyme that
catalyzes the rate-limiting step in the process
• Hormonal Control: In plants, growth regulators like auxins and cytokinins can also
influence fatty acid synthesis. In some cases, these hormones promote the
accumulation of fatty acids in seeds or storage tissues during development.
Importance of Fatty Acids in Plants
Fatty acids play multiple essential roles in plant biology:
• Structural Role: Fatty acids are key components of cell membranes, where they are
incorporated into phospholipids and glycolipids. These lipids help maintain the
fluidity and integrity of the membranes.
• Energy Storage: Fatty acids are stored as triacylglycerols in seeds and fruits,
providing a long-term energy reserve for seed germination and early seedling
growth.
• Signaling Molecules: Some fatty acids and their derivatives act as signaling
molecules that regulate processes like growth, development, and defense against
pathogens.
Application of Fatty Acid Biosynthesis in Biotechnology
Understanding the biosynthesis of fatty acids in plants has several applications in
biotechnology:
• Genetic Engineering: Scientists can manipulate fatty acid biosynthesis pathways to
produce oils with specific properties, such as increased unsaturation or altered chain
lengths, which are valuable for industrial applications, including biofuels and
biodegradable plastics
• Improvement of Crop Oil Content: Through genetic modification, researchers have
been able to increase the oil content in crops like soybeans and rapeseed, making
them more valuable as sources of vegetable oil(
In conclusion, the biosynthesis of fatty acids is a complex but highly regulated process that
is essential for plant growth, development, and survival. By converting simple molecules like
acetyl-CoA into long-chain fatty acids, plants are able to produce vital components for their
cell membranes and energy reserves. Advances in biotechnology are helping to harness this
process for various industrial and agricultural purposes.
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6. What is ammonium assimilation? Describe the importance of nitrate reductase and its
regulation.
Ans: The biosynthesis of fatty acids is a crucial process in plants, providing energy and essential
structural components for cellular functions. This process primarily takes place in the plastids of
plant cells and involves the conversion of simple molecules into complex fatty acids that are
necessary for the formation of cellular membranes and storage compounds like oils. To understand
the biosynthesis of fatty acids, let's break it down into simpler steps, along with an example that will
help clarify the entire process.
Key Concepts in Fatty Acid Biosynthesis
1. Location: The biosynthesis of fatty acids in plants occurs in plastids, particularly in
chloroplasts for photosynthetic tissues and in leucoplasts for non-photosynthetic
tissues. In plants, the most common fatty acids produced are palmitic acid (16:0) and
stearic acid (18:0) which serve as the precursors for more complex fatty acids.
2. Key Components:
o Acetyl-CoA: The starting molecule for fatty acid biosynthesis. It is derived
from carbohydrates through glycolysis and the tricarboxylic acid (TCA) cycle.
o Malonyl-CoA: This is formed from acetyl-CoA through a carboxylation
reaction and acts as the primary building block for fatty acid chains.
o Fatty Acid Synthase (FAS): A multi-enzyme complex that catalyzes the
synthesis of fatty acids from acetyl-CoA and malonyl-CoA.
Steps of Fatty Acid Biosynthesis
1. Formation of Malonyl-CoA: The first step in the biosynthesis of fatty acids is the
conversion of acetyl-CoA into malonyl-CoA. This is catalyzed by the enzyme acetyl-
CoA carboxylase (ACC), which adds a carbon dioxide molecule to acetyl-CoA.
2. Initiation of Fatty Acid Chain: The enzyme fatty acid synthase (FAS) initiates the
process by condensing one acetyl group with a malonyl group to form a four-carbon
chain. This is the starting point of the fatty acid chain.
3. Elongation Cycle: The next steps involve repeated cycles of elongation, where two
carbon atoms from malonyl-CoA are added to the growing fatty acid chain. Each
cycle involves the following steps:
o Condensation: Two carbons from malonyl-CoA are added to the growing
chain, releasing a carbon dioxide molecule.
o Reduction: The new carbon chain is reduced using NADPH as an electron
donor.
o Dehydration: A water molecule is removed to create a double bond.
o Second Reduction: The double bond is reduced again using NADPH, resulting
in a saturated fatty acid.
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4. Termination: The elongation cycle continues until the fatty acid reaches its final
length (usually 16 or 18 carbons in plants). Once the desired chain length is achieved,
the fatty acid is released from the enzyme complex. In plants, enzymes like
thioesterases play a role in determining the chain length by cleaving the fatty acid
from the enzyme complex.
Example: Palmitic Acid (16:0)
Palmitic acid is a 16-carbon saturated fatty acid that serves as a common example of fatty
acid biosynthesis. Its synthesis involves the repeated addition of two-carbon units from
malonyl-CoA to form a 16-carbon chain. Here’s a simplified outline of how palmitic acid is
synthesized:
• Step 1: Acetyl-CoA is carboxylated to form malonyl-CoA by acetyl-CoA carboxylase.
• Step 2: The acetyl group from acetyl-CoA and a malonyl group from malonyl-CoA are
condensed by fatty acid synthase to initiate the chain.
• Step 3: Through repeated cycles of elongation, the chain grows by two carbon atoms
in each cycle, using NADPH for reduction.
• Step 4: After seven cycles, a 16-carbon chain (palmitic acid) is formed, and the chain
is cleaved from the fatty acid synthase complex by a thioesterase enzyme.
Regulation of Fatty Acid Biosynthesis
The regulation of fatty acid biosynthesis is tightly controlled to ensure a balance between
the production and utilization of fatty acids. Some key factors that regulate this process
include:
• Energy Levels: The process requires a lot of energy in the form of ATP and reducing
power in the form of NADPH, which is primarily generated through the pentose
phosphate pathway and photosynthesis in plants
• Feedback Inhibition: The final products of fatty acid synthesis, such as long-chain
fatty acids, can inhibit key enzymes in the pathway to prevent overproduction. For
example, high levels of fatty acids inhibit acetyl-CoA carboxylase, the enzyme that
catalyzes the rate-limiting step in the process
• Hormonal Control: In plants, growth regulators like auxins and cytokinins can also
influence fatty acid synthesis. In some cases, these hormones promote the
accumulation of fatty acids in seeds or storage tissues during development.
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Importance of Fatty Acids in Plants
Fatty acids play multiple essential roles in plant biology:
• Structural Role: Fatty acids are key components of cell membranes, where they are
incorporated into phospholipids and glycolipids. These lipids help maintain the
fluidity and integrity of the membranes.
• Energy Storage: Fatty acids are stored as triacylglycerols in seeds and fruits,
providing a long-term energy reserve for seed germination and early seedling
growth.
• Signaling Molecules: Some fatty acids and their derivatives act as signaling
molecules that regulate processes like growth, development, and defense against
pathogens.
Application of Fatty Acid Biosynthesis in Biotechnology
Understanding the biosynthesis of fatty acids in plants has several applications in
biotechnology:
• Genetic Engineering: Scientists can manipulate fatty acid biosynthesis pathways to
produce oils with specific properties, such as increased unsaturation or altered chain
lengths, which are valuable for industrial applications, including biofuels and
biodegradable plastics(
• Improvement of Crop Oil Content: Through genetic modification, researchers have
been able to increase the oil content in crops like soybeans and rapeseed, making
them more valuable as sources of vegetable oil(
In conclusion, the biosynthesis of fatty acids is a complex but highly regulated process that
is essential for plant growth, development, and survival. By converting simple molecules like
acetyl-CoA into long-chain fatty acids, plants are able to produce vital components for their
cell membranes and energy reserves. Advances in biotechnology are helping to harness this
process for various industrial and agricultural purposes.
SECTION-D
7. What are transposable elements? Explain the mechanism of transposition.
Ans: Transposable Elements: Definition and Mechanism of Transposition
Transposable elements, also known as "jumping genes," are unique DNA sequences that can
move or "transpose" from one location to another within the genome. They are found in
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almost all living organisms, from bacteria to humans. This ability to move makes them an
interesting and important part of genetics because they can cause changes in the DNA,
sometimes leading to mutations or other alterations in genetic information.
What Are Transposable Elements?
Transposable elements are sections of DNA that can move from one part of a genome to
another. They do not have a fixed position, unlike most other parts of the DNA. These
movements can occur within the same chromosome or across different chromosomes. In
simpler terms, imagine that the genome is like a large book, and transposable elements are
sections of text that can be cut out and pasted somewhere else in the book.
They were first discovered by Barbara McClintock in maize (corn) during the 1940s and
1950s, for which she later won a Nobel Prize in 1983. Her work demonstrated that these
"jumping genes" can play a significant role in controlling gene expression and mutation, a
discovery that changed the way scientists think about genetics.
Types of Transposable Elements
There are two main types of transposable elements:
1. Class I Elements: Retrotransposons
o Retrotransposons are called so because they use an RNA intermediate to
move. They work by a process known as "copy and paste."
o The gene is first copied into an RNA molecule, which then gets converted
back into DNA by an enzyme called reverse transcriptase.
o The new DNA copy is then inserted back into a different location in the
genome, leaving the original transposable element in place.
o These retrotransposons can be further divided into two main types:
▪ LTR (Long Terminal Repeat) Retrotransposons: These have repeated
sequences at both ends, called Long Terminal Repeats.
▪ Non-LTR Retrotransposons: These do not have the Long Terminal
Repeats and are more abundant in humans. Examples include LINEs
(Long Interspersed Nuclear Elements) and SINEs (Short Interspersed
Nuclear Elements).
2. Class II Elements: DNA Transposons
o DNA transposons move through a "cut and paste" mechanism. Unlike
retrotransposons, they do not rely on an RNA intermediate.
o Instead, the transposable element is directly cut out from one part of the
genome and inserted into a new location by the enzyme transposase.
o This type of transposable element can physically move itself from one
location to another without being copied.
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Structure of Transposable Elements
Transposable elements, whether retrotransposons or DNA transposons, have specific
structures that help them move around the genome:
• Terminal Inverted Repeats (TIRs): These are sequences of nucleotides at both ends
of the DNA transposon that are identical but oriented in opposite directions. They
are recognized by transposase enzymes, which helps in the transposition process.
• Direct Repeats (DRs): When a transposable element is inserted into a new location,
it often creates short repeats of DNA called direct repeats on either side of the
inserted element.
• Transposase: This is an enzyme encoded by the transposon itself. The enzyme is
responsible for cutting and pasting the transposon in the genome.
Mechanism of Transposition
The movement or transposition of transposable elements is a highly regulated process, and
it happens through different mechanisms based on the type of element. The two primary
mechanisms are:
1. Copy and Paste Mechanism (Retrotransposition)
This mechanism applies to Class I elements or retrotransposons. Here is how it works:
o The transposable element is first transcribed into an RNA molecule from its
original location in the genome.
o The RNA then undergoes a process called reverse transcription, where it is
converted back into DNA by the enzyme reverse transcriptase.
o This new DNA copy is then inserted at a different location in the genome by
another enzyme called integrase.
o This method is called "copy and paste" because the original transposable
element stays in place, and a new copy is inserted elsewhere in the genome.
Example:
o Retrotransposons such as LINEs and SINEs in humans use this method. These
transposable elements make up a large portion of the human genome,
accounting for nearly 45%.
2. Cut and Paste Mechanism (DNA Transposition)
This mechanism is used by Class II elements or DNA transposons. Here's how it works:
o The transposase enzyme recognizes the transposable element by binding to
the terminal inverted repeats (TIRs).
o The enzyme then cuts out the entire transposon from the original location in
the genome.
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o Afterward, the transposable element is inserted into a new location in the
genome by the same enzyme.
o The "cut and paste" mechanism physically moves the transposon from one
location to another without creating a copy, unlike retrotransposons.
Example:
o P elements in fruit flies are an example of DNA transposons that use the cut-
and-paste mechanism.
Functions of Transposable Elements
Transposable elements are not just random pieces of DNA that move around. They play
important roles in various biological processes, including:
1. Genetic Diversity:
o Transposable elements introduce genetic variation by inserting themselves
into different parts of the genome. This movement can disrupt genes, create
new gene combinations, and lead to new traits, which might be beneficial or
harmful.
2. Gene Regulation:
o Transposable elements can influence how genes are expressed. For instance,
they might insert themselves into a regulatory region of a gene and either
enhance or suppress the activity of that gene. This can have a major impact
on development and cell functioning.
3. Genome Evolution:
o Over millions of years, transposable elements have significantly shaped the
evolution of genomes in all organisms. In humans, for example, around 50%
of our genome is made up of sequences that are either active or inactive
transposable elements.
4. Disease:
o Sometimes, the movement of transposable elements can cause diseases. If a
transposon inserts itself into a gene that controls cell division, it could lead to
uncontrolled cell growth, which may cause cancer.
o Diseases like hemophilia, Duchenne muscular dystrophy, and some cancers
have been associated with the movement of transposable elements
disrupting important genes.
Regulation of Transposition
The movement of transposable elements needs to be tightly controlled because unchecked
transposition could lead to genetic instability. Several mechanisms help to regulate their
activity:
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1. DNA Methylation:
o DNA methylation is a chemical modification where a methyl group is added
to the DNA, which usually suppresses gene activity. Many organisms use DNA
methylation to silence transposable elements and prevent them from
moving.
2. Small RNA Molecules:
o Small RNA molecules such as piRNAs (Piwi-interacting RNAs) and siRNAs
(small interfering RNAs) help to silence transposable elements by preventing
their transcription or targeting their RNA for degradation.
3. Chromatin Remodeling:
o Chromatin is the complex of DNA and proteins that forms chromosomes. By
tightening the chromatin structure around transposable elements, the cell
can make these regions less accessible to the machinery that would allow
them to move.
Applications of Transposable Elements in Biotechnology
Transposable elements have been used as tools in various biotechnological applications due
to their ability to move genes around. Some examples include:
1. Gene Therapy:
o Scientists can use modified transposons to insert therapeutic genes into a
patient’s cells, potentially correcting genetic defects. The transposon system
called Sleeping Beauty is one such tool used in gene therapy research.
2. Mutagenesis Studies:
o Transposons are used to introduce mutations into the DNA of organisms in a
controlled way, allowing scientists to study the functions of specific genes.
3. Transgenics:
o Transposable elements can be used to create genetically modified organisms
(GMOs) by inserting new genes into their genomes.
Conclusion
Transposable elements, or "jumping genes," are an essential part of genetics that can move
around the genome. There are two main types: retrotransposons, which move via a "copy
and paste" mechanism, and DNA transposons, which move through a "cut and paste"
method. Although they can cause mutations and disrupt normal gene function, they also
contribute to genetic diversity, evolution, and can be utilized in biotechnology for gene
therapy and genetic studies. Proper regulation of their movement is crucial to maintaining
genetic stability, and understanding their role in the genome helps shed light on the
complexity of genetics.
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8. Write a note on the functional definition and basic aspects of plant tissue culture.
Ans: Plant Tissue Culture: Functional Definition and Basic Aspects
Functional Definition of Plant Tissue Culture:
Plant tissue culture refers to the technique of growing and maintaining plant cells, tissues,
or organs in sterile conditions on a nutrient culture medium. This process is performed in
vitro (outside the plant body), which means it is done under controlled laboratory
conditions. Plant tissue culture is widely used in research and commercial applications to
propagate plants, conserve plant species, and develop genetically modified plants.
In simpler terms, plant tissue culture is a method to grow plants from very small parts (like
leaves, stems, or even single cells) in a sterile environment, without soil, using a special
nutrient solution. This technique ensures that the plants grow in a healthy and controlled
environment, free from diseases or pests.
Basic Aspects of Plant Tissue Culture:
1. Sterile Conditions: Plant tissue culture requires complete sterility to prevent
contamination by bacteria, fungi, or other microorganisms. Contamination can halt
plant growth and cause the entire culture to fail. This is achieved by using autoclaves
(machines that sterilize equipment) and keeping the work environment clean.
2. Nutrient Medium: The plant tissues or cells are grown on a specially prepared
nutrient medium, which contains all the necessary elements for plant growth, such
as vitamins, minerals, and plant hormones. The most common medium used is the
Murashige and Skoog (MS) medium. The composition of the medium can vary based
on the type of plant being cultured and the purpose of the experiment.
3. Growth Regulators: Plant hormones or growth regulators, like auxins, cytokinins,
and gibberellins, play a critical role in determining the type of growth and
development of the plant tissue. For example, high levels of auxins encourage root
formation, while cytokinins promote shoot development. These hormones help
manipulate the plant tissue into forming roots, shoots, or even entire plants.
4. Explants: An explant is the small piece of plant tissue used to start the tissue culture.
It can be taken from different parts of a plant, such as leaves, stems, roots, or buds.
The explant is sterilized and placed in the nutrient medium to begin the culture
process. Over time, the explant grows and forms a callus (a mass of undifferentiated
cells), which can be induced to form new plants.
5. Types of Plant Tissue Culture: Several methods exist in plant tissue culture, each
serving a different purpose. Some of the common types include:
o Micropropagation: This is the process of producing large numbers of
identical plants (clones) in a short period. Micropropagation is commonly
used for commercial plant production.
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o Callus Culture: A callus is a mass of undifferentiated cells formed from the
explant. Callus cultures are used for genetic modification and research
purposes.
o Protoplast Culture: This involves the removal of the plant cell wall, leaving
only the cell membrane and contents. Protoplasts can be fused together to
create hybrid plants.
o Embryo Culture: This technique is used to rescue embryos from seeds that
might not develop properly on their own. It is often used in breeding
programs.
6. Stages of Plant Tissue Culture: The process of plant tissue culture can be divided
into the following stages:
o Stage 1: Initiation: The explant is collected, sterilized, and placed in the
nutrient medium. The explant begins to grow, forming a callus or new shoots.
o Stage 2: Multiplication: The initial growth is multiplied by subculturing the
growing tissues into new nutrient media. This stage helps in producing a large
number of plants from a single explant.
o Stage 3: Rooting: Once enough shoots have been produced, they are
transferred to a medium containing high auxin levels to stimulate root
growth.
o Stage 4: Hardening: The plantlets developed in the tissue culture are
transferred to a greenhouse or controlled environment to adapt to soil and
outdoor conditions. This stage helps them transition from the sterile
environment to natural conditions.
7. Applications of Plant Tissue Culture:
o Mass Propagation of Plants: One of the most common uses of plant tissue
culture is to produce large numbers of identical plants in a short time. This is
especially useful for commercial crops, where uniformity and high-quality
plants are needed.
o Conservation of Endangered Species: Plant tissue culture allows scientists to
grow and conserve plant species that are at risk of extinction. It is particularly
useful for plants that are difficult to grow from seeds or those that produce
very few seeds.
o Genetic Modification and Research: Tissue culture is essential for creating
genetically modified plants. It provides a platform to introduce new genes
into a plant’s genome, allowing for the development of plants with desired
traits like disease resistance or increased yield.
o Production of Secondary Metabolites: Some plants produce valuable
compounds, like medicines or flavors, known as secondary metabolites.
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Tissue culture can be used to produce these compounds in large quantities
without needing to grow entire plants.
o Disease-Free Plants: Plants propagated through tissue culture are typically
free from diseases, pests, and viruses. This is crucial for crops that are highly
susceptible to diseases.
8. Advantages of Plant Tissue Culture:
o Rapid Multiplication: Tissue culture allows for the rapid production of a large
number of plants from a small piece of tissue.
o Disease-Free Propagation: The sterile environment ensures that the plants
produced are free from diseases and pests.
o Conservation of Plant Species: Rare and endangered plant species can be
conserved through tissue culture.
o Year-Round Production: Unlike traditional methods, tissue culture allows for
plant production year-round, irrespective of the seasons.
o Uniformity in Plants: Since all plants are clones, they are genetically identical,
which is beneficial for commercial agriculture where uniformity is desired.
9. Challenges in Plant Tissue Culture:
o Contamination: Maintaining sterility is a significant challenge in tissue
culture. Contaminants like bacteria and fungi can destroy entire cultures.
o High Initial Costs: The equipment and facilities required for plant tissue
culture are expensive, making it a costly endeavor for small-scale operations.
o Skill-Intensive Process: The process requires specialized skills and knowledge,
and any mistakes in handling the tissues can result in failure.
o Genetic Variability: Although tissue culture aims to produce identical plants,
sometimes genetic mutations can occur, leading to variability in the clones.
Conclusion:
Plant tissue culture is a highly versatile and powerful tool in modern plant biology and
biotechnology. It offers a means to propagate plants quickly and efficiently, conserve
endangered species, and produce disease-free, genetically modified plants. While it has
challenges like contamination and high costs, its benefits in mass production, research, and
conservation make it an indispensable part of plant science today
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