You are given a mixture that contains glutamic acid (pI = 3.2), arginine (pI = 10.8), and valine (pI = 6.0), and you subject the mixture to electrophoresis.

Which amino acids migrate towards the cathode when the electrophoresis is carried out at a pH of 7.1?

Which amino acids migrate toward the anode when the electrophoresis is carried out at a pH of 7.1?

Which amino acid migrates farthest toward the anode at a pH of 7.1?