the following amino acids are placed in an electric field between positive and negative poles. which will migrate the fastest toward the positive end of the electric field?
a. alanine at a pH of 11.0
b. alanine at a pH of 7.0
c. histidine at a pH of 8.0
d. alanine at a pH of 1.0
e. glutamine at a pH of 1.0