Valine is an amino acid used to make proteins. it is an essential amino acid meaning the body cannot synthesize it and thus, it must be obtained from food sources. its side-chain is an isopropyl group. what property of valine would you expect from this side chain?

C. It is hydrophobic.

Explanation: Valine is a essential aminoacid used to make proteins, that must be consumed in food. Since valine is an aminoacid, it has an amino group, a carboxyl group and a isopropyl group as a side chain. This isopropyl group is a chain of 3 carbons and by this chain valine is classified as a hidrophobic aminoacid.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.