Q1. Feedback inhibition of enzymes is affected by which of the following
A) enzyme
B) substrate
C) end products
D) intermediate end products
Answer: (C) end products
end products
Q2. An example of competitive inhibition of an enzyme is the inhibition of
A) succinic dehydrogenase by malonic acid
B) cytochrome oxidase by cyanide
C) hexokinase by glucose-6-phosphate
D) carbonic anhydrase by carbon dioxide
Answer: (A) succinic dehydrogenase by malonic acid
succinic dehydrogenase by malonic acid
Q3. Insulin is made up of _______ and _______.
A) glucose and fructose
B) glucose and fructose
C) fructose and mannose
D) mannose and glucose
Answer: (B) glucose and fructose
Insulin is a polysaccharide made up of glucose and fructose.
Q4. Enzymes increase the rate of reaction by
A) lowering activation energy
B) increasing activation energy
C) increasing temperature and pH
D) decreasing temperature and pH
Answer: (A) lowering activation energy
Enzymes increase the rate of reaction by decreasing the activation energy.
Q5. Which of the following statements regarding enzyme inhibition is correct?
A) Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
B) Non-competitive inhibitors often bind to the enzyme irreversibly
C) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
D) Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
Answer: (C) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Q6. Which of the following is not a pyrimidine?
A) Uracil
B) Cytosine
C) Guanine
D) Thymine
Answer: (C) Guanine
Guanine is a purine.
Q7. Hydrolysis of starch occurs with the help of
A) Peptidase
B) Amylase
C) Sucrose
D) Lipase
Answer: (B) Amylase
Amylase
Q8. Assertion: Arachidic acid is an unsaturated fatty acid Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids
A) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
B) Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
C) Assertion is true, but Reason is false.
D) Both Assertion and Reason are false
Answer: (D) Both Assertion and Reason are false
Both Assertion and Reason are false
Q9. Which of the following influence feedback inhibition of enzyme?
A) End product
B) External factors
C) Enzyme
D) Substrate
Answer: (A) End product
Q10. Which of the following is not a polysaccharide?
A) Lactose
B) Starch
C) Glycogen
D) Dextrin
Answer: (A) Lactose
Lactose is a disaccharide made up of glucose and galactose.
Q11. Inulin is made up of _______ and _______
A) glucose and fructose
B) glucose and fructose
C) fructose and mannose
D) mannose and glucose
Answer: (B) glucose and fructose
Inulin is a polysaccharide made up of glucose and fructose
Q12. A protein having both structural and enzymatic traits is
A) Collagen
B) Trypsin
C) Myosin
D) Actin
Answer: (C) Myosin
Myosin
Q13. NADP contains vitamin ______
A) B1
B) B2
C) B3
D) B12
Answer: (C) B3
B3 also named as niacin.
Q14. With reference to enzymes, which one of the following statements is true?
A) Apoenzyme = Holoenzyme + Coenzyme
B) Coenzyme = Apoenzyme + Holoenzyme
C) Holoenzyme = Apoenzyme + Coenzyme
D) Holoenzyme = Coenzyme – Apoenzyme
Answer: (B) Coenzyme = Apoenzyme + Holoenzyme
Holoenzyme = Apoenzyme + Coenzyme
Q15. Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of
A) allosteric inhibition
B) feedback inhibition
C) uncompetitive inhibition
D) competitive inhibition
Answer: (D) competitive inhibition
When substrate binds to the active site of the enzyme, it completes the reaction.When inhibitor binds to the active site of the enzyme, it blocks the reaction
Q16. The fastest enzyme known is
A) DNA polymerase
B) carbonic anhydrase
C) carbonic dehydrogenase
D) DNA ligase
Answer: (B) carbonic anhydrase
The fastest enzyme known is carbonic anhydrase. It converts 106 molecules of carbon dioxide molecules per second.
Q17. Lecithin is a
A) polysaccharide
B) protein
C) nucleic acid
D) lipid
Answer: (D) lipid
Lecithin is a phospholipid.
Q18. The minimum amount of energy required to initiate a chemical reaction is called
A) enzymatic energy
B) activation energy
C) substrate energy
D) initiation energy
Answer: (B) activation energy
The minimum amount of energy required to initiate a chemical reaction is called activation energy
Q19. Enzymes, vitamins and hormones are common in
A) Enhancing oxidative metabolism
B) Being synthesised in the body of organisms
C) Being proteinaceous
D) Regulating metabolism
Answer: (D) Regulating metabolism
Q20. Nitrogenous bases present in DNA
A) Adenine, guanine, cytosine, uracil
B) Adenine, guanine, cytosine, thymine
C) Adenine, thymine, uracil
D) Guanine, uracil
Answer: (B) Adenine, guanine, cytosine, thymine
Adenine, guanine, cytosine, thymine
Q21. Metabolic intermediates found in living system which are essential for growth and life is called___________
A) Saponins
B) Tannins
C) Secondary metabolite
D) Primary metabolites
Answer: (D) Primary metabolites
Primary metabolites
Q22. Enormous diversity of protein molecules is due to
A) R groups of amino acids
B) Sequence of amino acids
C) Peptide bonds
D) Amino groups of amino acids
Answer: (B) Sequence of amino acids
Sequence of amino acids
Q23. Anti-parallel strands of a DNA molecule mean that
A) One strand turns anticlockwise
B) Phosphate groups at the start of two DNA strands (poles) are in opposite position
C) Phosphate groups of two DNA strands at their ends share the same position
D) One strand turns clockwise
Answer: (B) Phosphate groups at the start of two DNA strands (poles) are in opposite position
Phosphate groups at the start of two DNA strands (poles) are in opposite position
Q24. The introduction of t-DNA into plants involves
A) Altering the pH of the soil, then heat shocking the plants
B) Exposing the plants to cold for a brief period
C) Allowing the plant roots to stand in water
D) Infection of the plant by Agrobacterium tumefaciens
Answer: (D) Infection of the plant by Agrobacterium tumefaciens
Q25. The most common monomer of carbohydrates is
A) Sucrose
B) Fructose
C) Maltose
D) Glucose
Answer: (D) Glucose
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