An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0) glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What is the fate of the three acids?

• A. Glutamic acid migrates to anode at pH 6. Arginine is present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution.
• B. Glutamic acid migrates to cathode and others remain uniformly distributed in solution.
• C. All three remain uniformly distributed in solution.
• D. All three move to cathode