Question

multiple choice question
what is the active site of an enzyme?
the coenzyme
the solution in which the enzyme is found
where it binds its substrate
the substance the enzyme acts upon

Explanation:

The active - site of an enzyme is a specific region on the enzyme molecule where the substrate binds. A coenzyme is a non - protein compound that assists an enzyme. The solution where the enzyme is found is just the environment. The substance the enzyme acts upon is the substrate, not the active site itself.

Answer:

Where it binds its substrate