The amino acid L-lysine has the amine side chain R = −(CH₂)₄NH₂.At low pH,all ionizable groups are protonated.What is the net charge on this fully protonated form of L-lysine?

Question

Quizplus · Accepted Answer

L-lysine has three ionizable groups: the amino group (NH3+), the carboxyl group (COOH), and the side chain amine group. At low pH, all these groups are protonated, giving a total net charge of +2 (NH3+ has +1, COOH is neutral, and the side chain NH3+ has +1).

The Amino Acid L-Lysine Has the Amine Side Chain R