Question:
The protein portion of an enzyme is called:
The protein portion of an enzyme is called:
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Remember the acronym: \textbf{Holoenzyme = Apoenzyme + Cofactor}. The apoenzyme is the protein part.
Updated On: May 4, 2025
- Coenzyme
- Apoenzyme
- Prosthetic group
- Cofactor
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The Correct Option is B
Solution and Explanation
Enzymes are biological catalysts. Many enzymes require non-protein components called cofactors for their activity. The protein part of the enzyme, without the cofactor, is called the apoenzyme. When the apoenzyme combines with its cofactor, it becomes a holoenzyme (the complete, active enzyme). Coenzymes are organic cofactors, while prosthetic groups are cofactors tightly bound to the apoenzyme. Cofactors are a broader term encompassing both coenzymes and prosthetic groups. Therefore, only the apoenzyme refers specifically to the protein portion.
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