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nmdcat.online June 27, 2026

The role of a coenzyme, such as NAD+, in an enzymatic reaction is to

A. Provide the structural framework for the enzyme protein
B. Act as a second, alternative substrate in a reversible reaction
C. Serve as a donor or acceptor of a specific chemical group
✓
D. Alter the equilibrium constant of the catalyzed reaction

📝 Explanation

Coenzymes are organic carrier molecules that participate directly in the reaction. NAD+, for example, accepts a hydride ion (H⁻) to become NADH, effectively acting as an electron carrier. It is chemically changed during the reaction and must be regenerated. An enzyme cannot alter the reaction's equilibrium constant.

📖 Additional Information

  • Provide the structural framework for the enzyme protein
  • Act as a second, alternative substrate in a reversible reaction
  • Serve as a donor or acceptor of a specific chemical group
  • Alter the equilibrium constant of the catalyzed reaction

Coenzymes are organic carrier molecules that participate directly in the reaction. NAD+, for example, accepts a hydride ion (H⁻) to become NADH, effectively acting as an electron carrier. It is chemically changed during the reaction and must be regenerated. An enzyme cannot alter the reaction's equilibrium constant.

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