Question

Functional unit of enzyme is called as

• A. apoenzyme
• B. Prosthetic group
• C. Coenzyme
• D. Holoenzyme

Hint:

Holoenzyme = Apoenzyme (Protein) + Cofactor (Non-protein).

Answer 1

The Correct Option is D

Step 1: Concept
Many enzymes require non-protein components to become catalytically active.

Step 2: Meaning
The protein part alone is the apoenzyme, and the non-protein part is the cofactor/coenzyme.

Step 3: Analysis
A holoenzyme represents the complete, active system consisting of the apoenzyme bound to its necessary cofactors.

Step 4: Conclusion
The holoenzyme is considered the functional unit of the enzyme as it possesses full catalytic activity.

Final Answer: (D)