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The lock-and-key mechanism refers to

the complementary shapes of an enzyme and a substrate.
the attractive forces between an enzyme and a substrate.
the ability of an enzyme to lower the activation energy of a reaction.
the ability of an enzyme to “unlock” the products of a reaction.

User Monocell
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Answer:

A the complementary shapes of an enzyme and a substrate.

Step-by-step explanation:

User Syed Daniyal Asif
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the lock and key theory refers to the complementary shapes of an enzyme and a substrate.

the shape of the enzyme is specific to the substrate it works on, similar to how the shape of a lock is specifically designed to work with one key. the shape.
User Atsakiridis
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