The substance that an enzyme acts on in a chemical reaction is called its
A)complex.
B)product.
C)modulator.
D)catalyst.
E)substrate.

Question

Quizplus · Accepted Answer

The substance that an enzyme acts on in a chemical reaction is called its substrate. This is the molecule or molecules that bind to the active site of the enzyme and are transformed through the catalytic process. The other options are not correct because a) a complex refers to an assembly of molecules or ions, not necessarily involving an enzyme; b) a product is the result of a chemical reaction, not necessarily the substrate; c) a modulator refers to a molecule that affects the activity of an enzyme, not the substrate; and d) a catalyst is a substance that increases the rate of a chemical reaction but does not act as a substrate for the enzyme.

The Substance That an Enzyme Acts on in a Chemical