Both glycine and alanine are amphoteric.

a. Explain the term amphoteric.

b. Explain the structural features of both glycine and alanine that enable them to be amphoteric.

c. i. Amino acids form zwitterions. Using glycine as an example, explain the term zwitterion.

ii. State and explain two physical properties of amino acids that can be explained by the existence of zwitterions.

d. Draw the two different dipeptides that can be formed when alanine and glycine react together through a condensation reaction.