Question

the substrate of an enzyme is
o an organic accessory molecule
o one of the amino acids that makes up the enzyme
o the molecule(s) released at the end of an enzyme - facilitated reaction
o what the enzyme acts on
o the shape of the enzyme

Explanation:

An enzyme - substrate complex is formed when an enzyme binds to its specific substrate. The substrate is the molecule upon which the enzyme acts to catalyze a chemical reaction. Organic accessory molecules are co - factors or co - enzymes, not substrates. Amino acids make up the enzyme itself, not the substrate. The molecules released at the end of an enzyme - facilitated reaction are products. The shape of the enzyme is related to its active site and specificity, not the substrate.

Answer:

the molecule(s) that the enzyme acts on