The $α$ -amino acid(s) which contains the aromatic side chain from the following is/are

proline

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tyrosine

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valine

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tryptophan

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Solution

The correct option is D tryptophan
Tyrosine, tryptophan and phenylalanine are aromatic $α$ -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 and tryptophan are not aromatic in nature.
Hence (b) and (d) are correct.

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