JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Biomolecules

Among the following compounds most basic amino acid is

(A)Asparagine
(B)Lysine✓ Correct
(C)Serine
(D)Histidine

Answer: (B)

Solution

The basic amino acids are those carrying an extra nitrogen in the side chain, which shows up as a high isoelectric point. Of the ones listed, lysine has a free

- NH_{2}

group on its side chain and the highest

pI

, around

9.7

, above histidine's imidazole side chain and well above the neutral side chains of serine and asparagine. So lysine is the most basic.

JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Single correct option

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