Q. What is the role of coenzymes in enzymatic reactions?
A.
To inhibit enzyme activity
B.
To provide additional energy
C.
To assist in substrate binding
D.
To stabilize the enzyme structure
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Solution
Coenzymes are organic molecules that assist enzymes by helping to bind substrates and facilitate reactions.
Correct Answer:
C
— To assist in substrate binding
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Q. What is the role of cofactors in enzyme activity?
A.
To provide energy for the reaction
B.
To stabilize the enzyme structure
C.
To assist in the catalytic process
D.
To act as a substrate
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Solution
Cofactors assist in the catalytic process by helping the enzyme to perform its function more effectively.
Correct Answer:
C
— To assist in the catalytic process
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Q. What is the role of competence factors in transformation?
A.
To facilitate cell division
B.
To enhance DNA uptake
C.
To inhibit gene transfer
D.
To promote transduction
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Solution
Competence factors enhance the ability of bacteria to take up DNA from their environment during transformation.
Correct Answer:
B
— To enhance DNA uptake
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Q. What is the role of dietary fiber in human nutrition?
A.
To provide essential amino acids
B.
To aid in digestion
C.
To supply energy
D.
To enhance fat absorption
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Solution
Dietary fiber aids in digestion by promoting regular bowel movements and preventing constipation.
Correct Answer:
B
— To aid in digestion
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Q. What is the role of disulfide bonds in peptides?
A.
To form peptide bonds
B.
To stabilize tertiary structure
C.
To create secondary structure
D.
To facilitate enzyme activity
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Solution
Disulfide bonds form between cysteine residues and help stabilize the tertiary structure of peptides and proteins.
Correct Answer:
B
— To stabilize tertiary structure
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Q. What is the role of DNA ligase in DNA replication?
A.
Unwinds DNA
B.
Synthesizes RNA primers
C.
Joins Okazaki fragments
D.
Adds nucleotides
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Solution
DNA ligase joins Okazaki fragments on the lagging strand during DNA replication.
Correct Answer:
C
— Joins Okazaki fragments
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Q. What is the role of DNA polymerase in DNA repair?
A.
To unwind the DNA double helix
B.
To synthesize new DNA strands
C.
To remove damaged DNA
D.
To ligate DNA fragments
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Solution
DNA polymerase synthesizes new DNA strands during the repair process.
Correct Answer:
B
— To synthesize new DNA strands
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Q. What is the role of encapsulation in synthetic seeds?
A.
To enhance flavor
B.
To protect the embryo
C.
To improve color
D.
To increase weight
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Solution
Encapsulation in synthetic seeds serves to protect the embryo from environmental stress and damage.
Correct Answer:
B
— To protect the embryo
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Q. What is the role of enzymes in fermentation?
A.
Increase temperature
B.
Catalyze reactions
C.
Consume substrates
D.
Produce waste products
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Solution
Enzymes catalyze biochemical reactions during fermentation, facilitating the conversion of substrates into products.
Correct Answer:
B
— Catalyze reactions
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Q. What is the role of ethylene oxide in sterilization?
A.
It is a disinfectant
B.
It is a sterilizing gas
C.
It is a cleaning agent
D.
It is a preservative
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Solution
Ethylene oxide is a sterilizing gas used to sterilize heat-sensitive medical equipment.
Correct Answer:
B
— It is a sterilizing gas
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Q. What is the role of feedback mechanisms in homeostasis?
A.
To amplify changes
B.
To maintain stability
C.
To create new functions
D.
To eliminate all variables
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Solution
Feedback mechanisms help maintain stability in the body by detecting changes and initiating responses to counteract those changes.
Correct Answer:
B
— To maintain stability
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Q. What is the role of glucagon in glucose metabolism?
A.
Increases glycogen synthesis
B.
Stimulates gluconeogenesis
C.
Inhibits lipolysis
D.
Decreases blood glucose levels
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Solution
Glucagon is produced by the alpha cells of the pancreas and increases blood glucose levels by stimulating gluconeogenesis and glycogenolysis in the liver.
Correct Answer:
B
— Stimulates gluconeogenesis
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Q. What is the role of glutamine in nitrogen metabolism?
A.
Energy source
B.
Nitrogen donor
C.
Carbon source
D.
Hormone precursor
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Solution
Glutamine acts as a nitrogen donor in various biosynthetic reactions, including nucleotide synthesis.
Correct Answer:
B
— Nitrogen donor
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Q. What is the role of glutamine in the body?
A.
Energy source
B.
Nitrogen transport
C.
Hormone production
D.
Antioxidant
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Solution
Glutamine serves as a major nitrogen transporter in the body, playing a key role in nitrogen metabolism.
Correct Answer:
B
— Nitrogen transport
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Q. What is the role of HDL cholesterol in the body?
A.
Transporting cholesterol to cells
B.
Removing excess cholesterol from the bloodstream
C.
Storing triglycerides
D.
Increasing inflammation
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Solution
HDL cholesterol helps remove excess cholesterol from the bloodstream, reducing the risk of heart disease.
Correct Answer:
B
— Removing excess cholesterol from the bloodstream
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Q. What is the role of histamine in the inflammatory response?
A.
Vasoconstriction
B.
Increased vascular permeability
C.
Pain sensation
D.
Fever induction
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Solution
Histamine plays a key role in increasing vascular permeability and causing vasodilation during the inflammatory response.
Correct Answer:
B
— Increased vascular permeability
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Q. What is the role of IgE antibodies?
A.
To fight bacterial infections
B.
To mediate allergic reactions
C.
To activate complement system
D.
To enhance phagocytosis
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Solution
IgE antibodies are primarily involved in allergic reactions and responses to parasitic infections.
Correct Answer:
B
— To mediate allergic reactions
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Q. What is the role of insulin in glucose metabolism?
A.
To increase blood glucose levels
B.
To promote glucose uptake by cells
C.
To stimulate glycogenolysis
D.
To inhibit protein synthesis
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Solution
Insulin facilitates the uptake of glucose by cells, thereby lowering blood glucose levels and promoting energy storage.
Correct Answer:
B
— To promote glucose uptake by cells
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Q. What is the role of insulin in the body?
A.
Increase blood glucose levels
B.
Decrease blood glucose levels
C.
Stimulate protein synthesis
D.
Promote fat breakdown
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Solution
Insulin is a hormone that decreases blood glucose levels by facilitating the uptake of glucose into cells.
Correct Answer:
B
— Decrease blood glucose levels
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Q. What is the role of integrase in the life cycle of Retroviridae?
A.
To replicate RNA
B.
To integrate viral DNA into the host genome
C.
To package viral proteins
D.
To synthesize viral proteins
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Solution
Integrase is responsible for integrating the viral DNA into the host genome during the life cycle of Retroviridae.
Correct Answer:
B
— To integrate viral DNA into the host genome
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Q. What is the role of interneurons in a reflex arc?
A.
To transmit signals to the brain
B.
To connect sensory and motor neurons
C.
To inhibit reflex actions
D.
To enhance muscle contraction
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Solution
Interneurons connect sensory and motor neurons within the spinal cord, facilitating the reflex response.
Correct Answer:
B
— To connect sensory and motor neurons
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Q. What is the role of interneurons in reflex pathways?
A.
To transmit signals from sensory neurons to motor neurons
B.
To amplify the reflex response
C.
To inhibit motor neuron activity
D.
To connect sensory and motor neurons
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Solution
Interneurons serve to connect sensory neurons to motor neurons within the reflex pathway, facilitating the reflex action.
Correct Answer:
D
— To connect sensory and motor neurons
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Q. What is the role of lactose permease in the lac operon?
A.
To synthesize lactose
B.
To transport lactose into the cell
C.
To degrade lactose
D.
To inhibit the repressor
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Solution
Lactose permease is a membrane protein that facilitates the transport of lactose into the E. coli cell.
Correct Answer:
B
— To transport lactose into the cell
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Q. What is the role of legumes in nitrogen fixation?
A.
They absorb nitrogen from the soil
B.
They host nitrogen-fixing bacteria
C.
They produce more oxygen
D.
They enhance photosynthesis
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Solution
Legumes form symbiotic relationships with nitrogen-fixing bacteria, allowing them to utilize atmospheric nitrogen.
Correct Answer:
B
— They host nitrogen-fixing bacteria
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Q. What is the role of ligase in recombinant DNA technology?
A.
To cut DNA strands
B.
To join DNA fragments together
C.
To replicate DNA
D.
To transcribe RNA
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Solution
Ligase is used to join DNA fragments together after they have been cut by restriction enzymes.
Correct Answer:
B
— To join DNA fragments together
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Q. What is the role of lysosomes in a cell?
A.
Energy production
B.
Digestion of macromolecules
C.
Protein synthesis
D.
Cell signaling
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Solution
Lysosomes contain enzymes that digest macromolecules, old cell parts, and microorganisms.
Correct Answer:
B
— Digestion of macromolecules
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Q. What is the role of memory cells in the immune system?
A.
To initiate the immune response
B.
To remember past infections
C.
To produce antibodies
D.
To destroy pathogens
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Solution
Memory cells are long-lived cells that remember past infections, allowing for a faster and stronger response upon re-exposure.
Correct Answer:
B
— To remember past infections
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Q. What is the role of monoclonal antibodies in COVID-19 treatment?
A.
Preventing infection
B.
Reducing viral load
C.
Enhancing vaccine efficacy
D.
Increasing antibody production
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Solution
Monoclonal antibodies can reduce viral load in patients with COVID-19.
Correct Answer:
B
— Reducing viral load
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Q. What is the role of monoclonal antibodies in medicine?
A.
To enhance immune response
B.
To target specific cells or proteins
C.
To replace missing antibodies
D.
To prevent infections
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Solution
Monoclonal antibodies are designed to target specific cells or proteins, making them useful in treatments for various diseases, including cancer.
Correct Answer:
B
— To target specific cells or proteins
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Q. What is the role of mycelium in fungi?
A.
Reproduction
B.
Nutrient absorption
C.
Photosynthesis
D.
Defense
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Solution
Mycelium is the vegetative part of fungi and is responsible for nutrient absorption.
Correct Answer:
B
— Nutrient absorption
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