Under what conditions can an allosteric effector affect the Vmax of an enzyme?

• A. Neither activators nor inhibitors affect Vmax.
• B. Only activators can increase Vmax, while inhibitors have no effect.
• C. Activators can increase Vmax, and inhibitors can decrease Vmax.
• D. Inhibitors can increase Vmax, and activators can decrease Vmax.

Answer: (C)