Question

quiz!
a reactant that fits into the active site of an enzyme is called...
a. an object
b. a product
c. a concentration
d. a substrate
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Explanation:

To solve this, we analyze each option:

• Option A: "an object" is too general and not related to enzyme - reactant interactions.
• Option B: A "product" is the result of a reaction, not the reactant that fits into the enzyme's active site.
• Option C: "a concentration" refers to the amount of a substance, not the reactant itself.
• Option D: By definition, a substrate is a reactant that fits into the active site of an enzyme to undergo a reaction catalyzed by the enzyme.

Answer:

D. a substrate