Lysine is least soluble in water in the $\mathrm{pH}$ range

Lysine is least soluble in water in the $\mathrm{pH}$ range
  1. 3 to 4
  2. 5 to 6
  3. 6 to 7
  4. 9 to 10

Solution

An amino acid has lowest solubility at its isoelectric point $(\mathrm{pH}$ at which the amino acid carries no charge) and the isoelectric point of lysine is 9.7.

Asked in: NEET 2016 (Phase 1)

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