- A Apoenzyme
- B Holoenzyme
- C Coenzyme
- D Proenzyme
Correct answer: B. Holoenzyme
Explanation: Holoenzyme = apoenzyme (protein part) + cofactor (metal ion or coenzyme). The apoenzyme alone is catalytically inactive.
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.