In the presence of a noncompetitive inhibitor, what happens to the apparent Km and Vmax of an enzyme-catalyzed reaction?

• A. Apparent Km remains unchanged, while Vmax decreases.
• B. Apparent Km increases, while Vmax remains unchanged.
• C. Both apparent Km and Vmax increase.
• D. Both apparent Km and Vmax decrease.

Answer: (A)