Valine is an essential amino acid since it cannot be synthesized by the body. Which of the following describes the side chain of valine?: (A) Contains a sulfhydryl group, (B) Contains a branched chain hydrocarbon, (C) Contains an aromatic ring, (D) Doesn't have a side chain
Answer is B. Valine, along with isoleucine and leucine, are branched chain amino acids. Cysteine contains a sulfhydryl group. Phenylalanine contains an aromatic ring. Glycine doesn't have a side chain.