module 3

Question 1

Why is every amino acid considered diprotic?

Answer 1

Because every amino acid has at least two groups that can accept or donate protons: the amino group (–NH₃⁺) and the carboxyl group (–COOH).

Question 2

What makes an amino acid triprotic?

Answer 2

Amino acids are triprotic if they have an additional ionizable group in their side chain.

Question 3

Which amino acids have ionizable side chains, making them triprotic?

Answer 3

Lysine, Arginine, Histidine, Aspartic acid, Glutamic acid, Cysteine, and Tyrosine.

Question 4

The dipolar ion of an amino acid is called a

Answer 4

Zwitterion

Question 5

for most diprotic amino acids, to be a zwitterion what will the PH range be?

Answer 5

2-10 (because for the amino group to be positive it needs to be below 10, and for the carboxyl group to be negative it needs to be above 2.)