Which one of the following amino acids may be considered a hydrophobic amino acid at physiological pH of 7.4?

Question

Quizplus · Accepted Answer

Isoleucine is a hydrophobic amino acid because its side chain is nonpolar and uncharged at physiological pH.  Hydrophobic amino acids are those with side chains that do not like to reside in an aqueous environment. For this reason, these amino acids are more often found buried within the hydrophobic core of a protein, or within the lipid portion of a membrane.

Which One of the Following Amino Acids May Be Considered