LC Biology Practice Questions - Leaving Certificate Biology (Ireland) Exam

According to the 'lock and key' model, why does an enzyme usually act on only one type of substrate?

The enzyme is destroyed by other substrates The active site has a specific shape complementary to the substrate Enzymes only work at one fixed temperature Substrates are too large to fit any enzyme

Correct Answer:

The active site has a specific shape complementary to the substrate

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