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.

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the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.