Which choice indicates the structure of the predominant form of each of the given amino acids at pH 6 and correctly predicts whether it will migrate toward the anode or cathode during electrophoresis?
◦ Phenylalanine is III and will move toward the cathode; leucine is II and does not migrate.
◦ Phenylalanine is I and will move toward the anode; leucine is II and will move toward the cathode.
◦ Phenylalnine is V and will not move; leucine is IV and will move toward the cathode.
◦ Phenylalanine is III and will move toward the anode; leucine is II and does not migrate.
◦ Phenylalnine is I and will not move; leucine is II and will move toward the cathode.