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Answer: 4. Lysine

A basic amino acid has an extra basic group (amino) in its side chain. Lysine, \(\mathrm{H_2N(CH_2)_4CH(NH_2)COOH}\), has two amino groups and one carboxyl group.

Serine and tyrosine have a hydroxyl in the side chain and alanine has a methyl group; they are neutral. Answer: option (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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