Question

multiple choice question
which term refers to the substance upon which an enzyme acts?
substrate
solute
active site
catalyst

Explanation:

In biochemistry, an enzyme acts on a specific substance called the substrate. A solute is a dissolved substance in a solution, the active - site is the part of the enzyme where the substrate binds, and a catalyst is a general term for a substance that speeds up a chemical reaction (enzymes are biological catalysts).

Answer:

A. Substrate