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Question

The α amino acid which contains the aromatic side chain is:

A
proline
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B
tyrosine
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C
valine
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D
serine
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Solution

The correct option is B tyrosine
To different degrees, all aromatic amino acids absorb ultraviolet light. Tyrosine and tryptophan absorb more than do phenylalanine. Tyrosine is the only one of the aromatic amino acids with an ionizable side chain.

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