The lock-and-key mechanism refers to?
a.) the complementary shapes of an enzyme and a substrate.
b.) the attractive forces between an enzyme and a substrate.
c.) the ability of an enzyme to lower the activation energy of a reaction.
d.) the ability of an enzyme to “unlock” the products of a reaction.

The answer is D. The lock-and-key mechanism is instrument proposed in 1890 by Emil Fischer (1852–1919) to clarify authoritative between the dynamic site of a compound and a substrate atom. The dynamic site was thought to have a settled structure (the bolt), which precisely coordinated the structure of a particular substrate (the key).

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