Which Substance is Most Likely an Enzyme

Question

Which substance is most likely an enzyme?
A) proline
B) stearic acid
C) endopeptidase
D) acetylcholine

Accepted Answer

Enzymes are proteins that catalyze biochemical reactions. Endopeptidase is an example of an enzyme that breaks peptide bonds within a protein. The other choices, proline, stearic acid, and acetylcholine, are not enzymes.