Name three amino acids that are positively charged at a neutral pH.

Question

Quizplus · Accepted Answer

Lysine and arginine contain amino groups with a pKa above a neutral pH, which means they will be positively charged at neutral pH. Histidine also has an amino group with a pKa above a neutral pH, but its side chain can also act as a weak acid, leading to a more variable charge at neutral pH. Cysteine, proline, and glutamine all have neutral side chains and are not positively charged at neutral pH.

Name Three Amino Acids That Are Positively Charged at a Neutral