NEET 2025 · BiologyEnzymesPrevious Year Question
Which one of the following enzymes contains ‘Haem’ as the prosthetic group?
Answer: (B) Catalase. Answer: (B) Catalase.
- A.Succinate dehydrogenase
- B.Catalase✓
- C.RuBisCo
- D.Carbonic anhydrase
Correct Answer
(B) Catalase
Solution & Explanation
Answer: (B) Catalase. Solution: A prosthetic group is an organic cofactor that is tightly bound to the apoenzyme. NCERT cites peroxidase and catalase — which break down hydrogen peroxide into water and oxygen — as enzymes in which haem is the prosthetic group and part of the active site. Succinate dehydrogenase, RuBisCO and carbonic anhydrase do not use haem as their prosthetic group, so catalase is the correct choice. NCERT Reference: Ch 9, p.118, line ~8 — "in peroxidase and catalase, which catalyze the breakdown of hydrogen peroxide to water and oxygen, haem is the prosthetic group and it is a part of the active site of the enzyme."
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