NEET 2025 · BiologyEnzymesPrevious Year Question
The protein portion of an enzyme is called:
Answer: (A) Apoenzyme. Answer: (A) Apoenzyme.
- A.Apoenzyme✓
- B.Prosthetic group
- C.Cofactor
- D.Coenzyme
Correct Answer
(A) Apoenzyme
Solution & Explanation
Answer: (A) Apoenzyme. Solution: When non-protein cofactors bind to an enzyme to make it catalytically active, NCERT calls the protein portion of the enzyme the apoenzyme. The prosthetic group, coenzyme and metal ion are the three kinds of cofactors (the non-protein constituents), so they are not the protein part. NCERT Reference: Ch 9, p.118, line ~3 — "the protein portion of the enzymes is called the apoenzyme."
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