Enzymes MCQs for MDCAT Practice

Biology section, Enzymes chapter. Sample questions from past PMC papers.

1. Question 1
   In competitive Inhibition, two things attached to enzyme’s active site are:
   • A.Inhibitor
   • B.Substrate
   • C.Both A and B
   • D.None of these
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2. Question 2
   The competitive inhibitors have structural similarity with:
   • A.Active site
   • B.Binding site
   • C.Substrate
   • D.Coenzyme
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3. Question 3
   Ribozyme is:
   • A.Antibiotic
   • B.RNA enzyme
   • C.Protein enzyme
   • D.Hormone
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4. Question 4
   Feedback inhibition is an example of which type of enzyme inhibition?
   • A.Competitive inhibition
   • B.Non competitive inhibition
   • C.Uncompetitive inhibition
   • D.Irreversible inhibition
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5. Question 5
   Enzymes which are involved in transfer of electrons are known as:
   • A.Oxidases
   • B.Dehydrogenases
   • C.Hydrolases
   • D.Both A and B
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6. Question 6
   The Inhibitor which may destroy the Globular structure of Enzyme is:
   • A.Competitive
   • B.Non-competitive
   • C.Reversible
   • D.Irreversible
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7. Question 7
   Which of the following is an inactive enzyme without its cofactor?
   • A.Coenzyme
   • B.Apoenzyme
   • C.Holoenzyme
   • D.Denatured enzyme
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8. Question 8
   Enzymes that are involved in the control and regulation of biological processes are?
   • A.Allosteric enzymes
   • B.Inhibitors
   • C.Regulators
   • D.None of these
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