Lysine is least soluble in water in the `pH` range.

Options

A. 3 to 4
B. 5 to 6
C. 6 to 7
D. 8 to 9

Answer

D

Explanation

Lysine is a basic amino acid and , therefore, its isoelectric point lies in the basic range 8-9 . At the isoelectric point, an amino acid has the lowest solubility.