Question

Non-protein organic part of the enzyme, which is essential for catalytic activities of the enzyme is known as

• A. Coenzyme
• B. Prosthetic group
• C. Isozyme
• D. Allosteric enzyme

Hint:

Prosthetic group: Tightly bound to apoenzyme (e.g., heme).
Coenzyme: Loosely bound (e.g., NAD, CoA).
Cofactor: Inorganic ion (e.g., Mg2+, Zn2+).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Enzymes are composed of protein (apoenzyme) and non-protein components.

Step 2: Detailed Explanation:
Prosthetic group is the non-protein organic part of the enzyme that is tightly bound.
It is essential for the catalytic activity of the enzyme.
Characteristics:
- Tightly bound to the apoenzyme.
- Often covalently attached.
- Examples: Heme group in catalase, biotin in carboxylases.
Other terms:
- Coenzyme (A): Non-protein organic molecule loosely bound to the enzyme.
- Isozyme (C): Different forms of the same enzyme.
- Allosteric enzyme (D): Enzyme with regulatory sites.
Thus, the non-protein organic part essential for catalytic activity is the prosthetic group.

Step 3: Final Answer:
Thus, the non-protein organic part of the enzyme is known as the prosthetic group.
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