What effect does competitive enzyme inhibition have on Km and Vmax?

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Km decreases while Vmax increasesBoth Km and Vmax increaseBoth Km and Vmax decreaseKm increases but Vmax remains the sameKm remains unchanged and Vmax decreases

Explanation

In competitive inhibition, the inhibitor competes with the substrate for the active site, which raises the apparent Km (indicating decreased affinity) but does not affect the maximum reaction velocity (Vmax remains unchanged).