Question

the ______________ is where a substrate binds to an enzyme.
active site
coenzyme
apoenzyme

Explanation:

In enzyme - substrate interactions, the active site is the specific region on the enzyme where the substrate binds. A coenzyme is a non - protein organic molecule that helps an enzyme in its function. An apoenzyme is the protein part of an enzyme that requires a cofactor or coenzyme to be active.

Answer:

A. active site