Question

Haem group associated with the enzyme catalase is an example of

• A. Apoenzyme
• B. Prosthetic group
• C. Co-enzyme
• D. Co-factor

Hint:

Haem in catalase is a prosthetic group — a tightly bound non-protein part essential for enzyme activity.

Answer 1

The Correct Option is B

The haem group in the enzyme catalase is a non-protein component that is tightly and permanently bound to the protein part of the enzyme. Such non-protein parts that are covalently or firmly attached to the enzyme and essential for its activity are known as prosthetic groups.
- An apoenzyme is the protein part of the enzyme without its non-protein component.
- A coenzyme is a loosely bound organic molecule (often derived from vitamins) that assists enzyme activity.
- A cofactor is a general term that includes both prosthetic groups and coenzymes.
Since the haem group is tightly bound and essential for the functioning of catalase, it is classified as a prosthetic group.

Answer 2

Haem group associated with the enzyme catalase is an example of:

The haem group in catalase is a non-protein component that is tightly bound to the enzyme and essential for its catalytic activity.

Such a non-protein group that is permanently attached to an enzyme and required for its function is called a prosthetic group.

Therefore, the haem group in catalase acts as a prosthetic group, helping in the breakdown of hydrogen peroxide into water and oxygen.

Correct Answer: Prosthetic group