An electric current is passed through an aqueous solution `(` buffered at `pH=6.0)` of a alanine `(pl=6.0)` and arginine `(pI=10.2)` . The two amino acids can be separated because

Options

A. alanine migrates to anode, and arginine to cathode.
B. alanine migrates to cathode, and arginine to anode.
C. alanine does not migrate, while arginine migrates to cathode.
D. alanine does not migrate, while arginine migrates to anode.

Answer

C

Explanation

At the given pH (6) of the solution, alanine (pl = 6.0), exists as a dipolar ion while arginine (pI = 10.2) exists as a cation. Hence on passing an electric current, alanine will not migrate to any electrode, while arginine will migrate to cathode.