Question

The $\alpha$-amino acid which contains the aromatic side chain from the following is :

• A. proline
• B. tyrosine
• C. valine
• D. serine

Answer 1

The correct option is B tyrosine

Tyrosine, tryptophan and phenylalanine are aromatic $\alpha$-amino acids. Tyrosine is the only of the aromatic amino acids with an ionizable side chain. Among the given options, amino acids other than tyrosine are not aromatic in nature.
Hence, (b) is correct.