Which of the following amino acids exists predominantly as a zwitterion? The terminal amino group, terminal carboxyl group, and side chain pKa values can be found in Table 2.1.
For isoleucine at pH = 2, what is the ratio of the concentration of the zwitterionic amino acid species to the neutral species? All pKa values can be found in Table 2.1.
For aspartic acid at pH = 7, what is the ratio of the concentration of the neutral amino acid species to the negatively charged species (zwitterion backbone and deprotonated side chain)? All pKa values can be found in Table 2.1.
