Topic: Enzymes: types, properties, action, classification· Cell Structure and Function

Which one of the following statements is correct, with reference to enzymes ?

1. Holoenzyme = Apoenzyme + Coenzyme

2. Coenzyme = Apoenzyme + Holoenzyme

3. Holoenzyme = Coenzyme + Co-factor

4. Apoenzyme = Holoenzyme + Coenzyme

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 1. Holoenzyme = Apoenzyme + Coenzyme

Key idea: An active conjugated enzyme has a protein part and a non-protein part.

The protein part is the apoenzyme. The non-protein part is the cofactor, which may be a coenzyme (organic), a prosthetic group or a metal ion. Apoenzyme + cofactor gives the active holoenzyme. Among the options, only (1) puts the terms in a valid relation; in the others a whole is shown as a part of itself or a part as a sum. Answer: (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following statements is correct, with reference to enzymes ?

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