JUPEBBiologyEnzymes

A competitive inhibitor reduces enzyme activity because it

Ahas a shape similar to the substrate and competes for the active site.CORRECT
Bbinds to the substrate and destroys it.
Craises the temperature of the reaction.
Ddenatures the enzyme permanently.
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Why the answer is A, and why the others tempt you.
Because the inhibitor resembles the substrate, it occupies the active site and blocks substrate binding. The effect can be reduced by increasing the substrate concentration, since substrate and inhibitor compete for the same sites.
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