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NEET Chemistry Biomolecules 2025 NEET 2025

NEET Chemistry Question (2025) — Solution

Question

The protein portion of an enzyme is called:

Options

  1. A. Cofactor
  2. B. Coenzyme
  3. C. Apoenzyme
  4. D. Prosthetic group

Answer

C. Apoenzyme

Step-by-step solution

There are number of cases in which non-protein constituents called co-factors are bound to the enzyme to make the enzyme catalytically active. In these instances, the protein portion of the enzymes is called the apoenzyme. Three kinds of co-factors are identified prosthetic groups, co-enzymes and metal ions. Prosthetic groups are organic compounds and they are tightly bound with apoenzyme. Co-enzymes are also organic compounds but their association with apoenzyme is only transient.

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