Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Enzymes

1. Enzymes are
a) Carbohydrate
b) RNA
c) Proteins
d) Fats
2. The term enzymes are coined by
a) Pasteur
b) Buchner
c) Urey Miller
d) Kuhne
3. The fastest enzymes is
a) Pepsin
b) Carbonic unhydrase
c) DNA gyrase
d) DNA polymerase
4. Fat is hydrolysed by the enzyme known as
a) Trypsin
b) Lipase
c) pepsin
d) Amylase
5. The term apoenzyme is applicable to
a) Simple enzyme
b) Protein part of conjugate enzyme
c) Organic cofactor of a conjugate enzyme
d) Inorganic cofactor of a conjugate enzyme
6. Enzymes
a) Do not require activation energy
b) Do not change requirement of activation energy
c) Increase requirement of activation energy
d) Lowest requirement of activation energy
7. Zymogen is
a) Enzyme poison
b) Enzyme modulator
c) Enzyme precursor
d) Enzyme inhibitor

8. Allosteric enzyme possesses
a) Active site and an allosteric site
b) Active site and two types of allosteric sites
c) Active site and three types of allosteric sites
d)  Three types of allosteric sites
9. Enzyme generally have
a) Same pH and temperature optima
b) Same pH but different temperature optima
c) Different pH but same temperature optima
d) Different pH and different temperature optima
10. The enzyme which forms the peptide bond is known as
a) Carbonic unhydrase
b) Peptidase
c) Carbohydrase
d) Peptidyl transferase
11. The enzyme, tyrosinase, is activated by
a) Iron
b) Copper
c) Zinc
d) Potassium
12. “Lock and key” theory of enzyme action was proposed by
lock and key
Lock and Key Theory

a) Fischer
b) Koshland
c) Kuhne
d) Arrhenius
13. Trypsin are active in
a) Acidic
b) Alkaline
c) neutral
d) None of these
14. Koshland’s theory of enzyme action is known as
induced fit theorey
a) Reduced fit theory
b) Lock and key theory
c) Induced fit theory
d) Enzyme coenzyme theory

15. The enzymes involved in feedback inhibition are called
a) Allosteric enzymes
b) Holoenzymes
c) Apoenzymes
d) Coenzymes
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Answers:
1. c) Proteins
2. d) Kuhne
3. b) Carbonic unhydrase
4. b) Lipase
5. b) Protein part of conjugate enzyme
6. d) Lowest requirement of activation energy
7. c) Enzyme precursor
8. b) Active site and two types of allosteric sites
9. a) Same pH and temperature optima
10. d) Peptidyl transferase
11. b) Copper
12. a) Fischer
13. b) Alkaline
14. c) Induced fit theory
15. a) Allosteric enzymes 
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