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nmdcat.online July 11, 2026

The primary effect of a non-competitive inhibitor on an enzyme-catalyzed reaction is to

A. Compete directly with the substrate for occupation of the active site
B. Reduce the Vmax of the reaction without significantly altering the Km for the substrate
✓
C. Increase the apparent Km for the substrate while leaving Vmax unchanged
D. Irreversibly modify the active site serine residue

📝 Explanation

A non-competitive inhibitor binds to a separate site, forming a non-productive complex that lowers the concentration of functional enzyme, thus reducing Vmax.

📖 Additional Information

  • Compete directly with the substrate for occupation of the active site
  • Reduce the Vmax of the reaction without significantly altering the Km for the substrate
  • Increase the apparent Km for the substrate while leaving Vmax unchanged
  • Irreversibly modify the active site serine residue

A non-competitive inhibitor binds to a separate site, forming a non-productive complex that lowers the concentration of functional enzyme, thus reducing Vmax.

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