Which of the following is a basic amino acid?
(3) Lysine
As per NCERT, an amino acid having more amino groups than carboxyl groups is basic.
Lysine: H2N-(CH2)4-CH(NH2)-COOH ⇒ two -NH2 groups and one -COOH group ⇒ basic.
Alanine (R = -CH3), tyrosine (R = -CH2-C6H4-OH) and serine (R = -CH2OH) have one amino and one carboxyl group ⇒ neutral.
Answer: (3)
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