MCQ Collection
GAT Subject Biological Sciences MCQs
Practice GAT Subject Biological Sciences questions with answers and explanations.
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A.
Part that stores DNA
B.
The membrane around the enzyme
C.
A site for ATP synthesis only
D.
Region where the substrate binds and reaction occurs
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Correct Answer: D. Region where the substrate binds and reaction occurs
Explanation:
The active site has a shape and chemistry suited to its substrate.
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A.
The reactant acted upon by an enzyme
B.
The product only
C.
The enzyme's inhibitor
D.
A membrane lipid
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Correct Answer: A. The reactant acted upon by an enzyme
Explanation:
Substrates bind to active sites.
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A.
Activity always rises without limit
B.
Activity rises to an optimum and then may fall as the enzyme denatures
C.
Temperature has no effect
D.
Activity always falls with warming
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Correct Answer: B. Activity rises to an optimum and then may fall as the enzyme denatures
Explanation:
Warming increases molecular collisions up to an optimum.
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A.
All enzymes work best at pH 7
B.
PH affects only carbohydrates
C.
Each enzyme has an optimal pH range
D.
PH never changes protein shape
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Correct Answer: C. Each enzyme has an optimal pH range
Explanation:
PH alters ionization of amino-acid side chains.
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A.
A structural polysaccharide in plants
B.
A protein hormone
C.
A membrane lipid
D.
A glucose-storage polysaccharide in animals
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Correct Answer: D. A glucose-storage polysaccharide in animals
Explanation:
Glycogen is stored mainly in liver and muscle.
Choose an option to check your answer.
A.
A glucose-storage polysaccharide in plants
B.
An animal structural protein
C.
A nucleic acid
D.
A phospholipid
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Correct Answer: A. A glucose-storage polysaccharide in plants
Explanation:
Plants store glucose mainly as starch.
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A.
An animal storage carbohydrate
B.
A structural polysaccharide in plant cell walls
C.
A lipid in membranes
D.
An enzyme
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Correct Answer: B. A structural polysaccharide in plant cell walls
Explanation:
Cellulose consists of beta-glucose units.
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A.
Immediate genetic coding
B.
Ribosome formation only
C.
Long-term energy storage, membranes, and signaling
D.
Oxygen transport only
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Correct Answer: C. Long-term energy storage, membranes, and signaling
Explanation:
Lipids include fats, phospholipids, steroids, and waxes.
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A.
Three sugars joined to glycerol
B.
A protein with three subunits
C.
A nucleotide triplet
D.
Glycerol joined to three fatty acids
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Correct Answer: D. Glycerol joined to three fatty acids
Explanation:
Triglycerides are major energy-storage lipids.
Choose an option to check your answer.
A.
A fatty acid with no carbon-carbon double bonds
B.
A fatty acid with one or more double bonds
C.
A fatty acid containing nitrogen
D.
A carbohydrate chain
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Correct Answer: A. A fatty acid with no carbon-carbon double bonds
Explanation:
Saturated fatty acids are fully saturated with hydrogen.
Choose an option to check your answer.
A.
A fatty acid with only single bonds
B.
A fatty acid with one or more carbon-carbon double bonds
C.
A protein subunit
D.
A nucleic acid base
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Correct Answer: B. A fatty acid with one or more carbon-carbon double bonds
Explanation:
Double bonds introduce bends into fatty-acid chains.
Choose an option to check your answer.
A.
Carbohydrates, lipids, proteins, and nucleic acids
B.
Vitamins, minerals, water, and salts
C.
Atoms, ions, tissues, and organs
D.
Sugars, acids, bases, and gases
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Correct Answer: A. Carbohydrates, lipids, proteins, and nucleic acids
Explanation:
The four major macromolecule groups perform structural, energetic, catalytic, and informational roles.
