The electrophoresis of a mixture of histidine (His), aspartic acid (Asp) and phenylalanine (Phe) is carried out a pH of 5.91. What amino acid will This bear no net charge at pH 5.91 and so will remain at the origin, carry a net negative charge at pH 5.91 and so will migrate towards the positive electrode and will carry a net positive charge at pH 5.91 and so will migrate to the negative electrode?
