Question

A non-protein organic part attached firmly by covalent linkage to apoenzyme is

• A. Cofactor
• B. Coenzyme
• C. Prosthetic group
• D. Activator

Answer 1

Answer: (C)

Prosthetic group

The cofactor is a non-protein part of the enzyme. It can be metal ions or the organic chemical. The cofactors which are organic chemicals are known as a coenzyme. These are loosely attached to the apoenzyme. The tightly bound coenzymes are the prosthetic group. For example, a heme group is a prosthetic group consisting of a protoporphyrin ring and a central iron. A conjugate protein combined with its specific prosthetic group is termed a holoprotein

So, the correct answer is option C.