Question

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?

Answer 1

Answer: 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 2

hydrophobicity.

Step-by-step explanation:

The isopropyl group which is present as the side chain of valine amino acid is responsible for making this amino acid hydrophobic in nature. An aliphatic hydrocarbon chain which is devoid of any functional group like -OH, -COOH etc. is always water repelling i.e. hydrophobic because it does not have any charge in it as a result of which it fails to interact with water which is polar in nature. The more will be the number of carbon atoms, the more will be the hydrophobicity. This is the reason why valine has more hydrophobic index than alanine. Alanine which has only one carbon in the side chain is considered less hydrophobic than valine which has 3 carbon atoms in the side chain.