1) What is the count of genes that determine the synthesis of one enzyme?
(a) One
(b) Four
(c) Eight
(d) Sixteen
Answer: (a)
2) Macromolecule chitin is
(a) a simple polysaccharide
(b) sulphur containing polysaccharide
(c) phosphorous containing polysaccharide
(d) nitrogen containing polysaccharide
Answer: (d)
3) Ribozymes are
(a) RNA acting as enzymes
(b) Ribose sugar acting as enzyme
(c) Antibodies acting as enzymes
(d) Protein acting as enzyme
Answer: (a)
4) Tryptophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consists of
(a) a protein A and one subunit A
(b) a protein designated A
(c) two proteins designated A and B
(d) a protein designated B
Answer: (c)
5) Holoenzyme is made of
(a) Apoenzyme and Zymogen
(b) Apoenzyme and Co-enzyme
(c) Co-enzyme and Prosthetic group
(d) Prosthetic group and Co-factor
Answer: (b)
6) Enzyme-driven metabolic pathways can be made more efficient by
(a) grouping enzymes into multienzyme free-floating complexes
(b) concentrating enzymes with specific cellular compartments
(c) fixing enzymes into membranes so they are adjacent to each other
(d) all of these
Answer: (d)
7) Abzymes are
(a) Proteins
(b) DNAs
(c) RNAs
(d) Antibodies
Answer: (d)
8) Which of the following is not a co-enzyme
(a) NAD
(b) NADP
(c) FAD
(d) Mn++
Answer: (d)
9) Which enzymes do not require co-enzymes for their activity ?
(a) The extracellular enzymes
(b) The intracellular Enzymes
(c) The mitochondrial enzymes
(d) The Proenzymes
Answer: (a)
10) This enzyme was first isolated and purified in the form of crystals
(a) Urease
(b) pepsin
(c) Amylase
(d) Ribonuclease
Answer: (a)
11) What are ribozymes ?
(a) RNA acting as enzymes
(b) Protein acting as enzymes
(c) Ribose sugar acting as enzymes
(d) Antibodies acting as enzymes
Answer: (a)
12) Activity of allosteric enzymes are influenced by
(a) Allosteric modulators
(b) Allosteric site
(c) Catalytic site
(d) None of the above
Answer: (a)
13) Feed back inhibition means
(a) Initial product inhibition
(b) End Product inhibition
(c) Enzymatic induction
(d) None of the above
Answer: (b)
14) In competitive inhibition, inhibitors bears a close structural similarity with the
(a) Co-enzyme
(b) Co-factor
(c) Prosthetic group
(d) Substrate
Answer: (d)
15) With regards to enzyme action, this statement is incorrect
(a) Malonate is a competitive inhibitor of succinic dehydrogenase
(b) the substrate binds with the enzyme at its active site
(c) the non-competitve inhibitor binds the enzyme at a site distinct from that binding the substrate
(d) addition of a lot of succinates does not reverse the inhibition of succinic dehydrogenase by malonate
Answer: (d)
16) Enzyme acts best at a particular temperature called
(a) Catalytic Temperature
(b) At normal Body temperature
(c) Optimum temperature
(d) None of the above
Answer: (c)
17) “Ping Pong” reaction is the other name for
(a) Single-substrate reaction
(b) Single-displacement bi-substrate reaction
(c) Double-displacement bi-substrate reaction
(d) Lysine
Answer: (c)
18) Uncatalyzed reaction shows ______________ activation energy
(a) Lower
(b) Higher
(c) Moderate
(d) Optimum
Answer: (b)
19) In alcoholism, this enzyme is elevated
(a) acid phosphatase
(b) hepatitis
(c) serum glutamate pyruvate transaminase
(d) glutamyl transpeptidase
Answer: (d)
20) Lock and Key model is also known as
(a) Template model
(b) Induced fit model
(c) Khosland’s Model
(d) Enzyme-substrate interaction model
Answer: (a)
21) Which bond is not associated with Enzyme-substrate interaction –
(a) Hydrogen bonds
(b) Ionic bonds
(c) Di-sulfide bonds
(d) Van deer Waal’s force of attraction
Answer: (c)
22) Which of the following statement is incorrect
(a) Enzymes are protein in nature
(b) Enzymes are colloidal in nature
(c) Enzymes are thermolabile
(d) Enzymes are inorganic catalyst
Answer: (d)
23) Apoenzymes dissociates from co-enzymes due to
(a) Change in pH
(b) Change in temperature
(c) Change in substrate concentration
(d) Change in inhibitor concentration
Answer: (a)
24) This statement about enzymes is true
(a) enzymes accelerate reactions by lowering the activation energy
(b) enzymes are proteins whose three-dimensional form is key to their function
(c) enzymes do not alter the overall change in free energy for a reaction
(d) all of these
Answer: (d)
25) Which of the following enzyme inhibitions shows decreased Km Value ?
(a) Competitive inhibition
(b) Un-competitive inhibition
(c) Non-competitive inhibition
(d) Feed back inhibition
Answer: (a)
26) Reversible covalent modification involves
(a) Activation of proenzymes
(b) Inhibition of proenzymes
(c) Denaturation of proenzymes
(d) None of the above
Answer: (a)
27) The nature of an enzyme is
(a) Lipid
(b) Vitamin
(c) Carbohydrate
(d) Protein
Answer: (d)
28) The enzyme COX-1 is vital for human health in this way:
(a) it is a chemical derivative of aspirin
(b) catalyzes the hormone-production which maintains the stomach lining
(c) critical for the biosynthesis of DNA
(d) helps in the transportation of carbon dioxide in the blood
Answer: (b)
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| MCQ on enzyme - Biochemistry |
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