Which of the following amino acids has a net charge of +1 at pH 4 and a net charge of 0 at pH 8?
A) glu
B) arg
C) his
D) tyr

Name: Which of the following amino acids has a net charge of +1 at pH 4 and a net charge of 0 at pH 8? A) glu B) arg C) his D) tyr
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Question

Quizplus · Accepted Answer

Histidine (his) has a side chain pKa around 6.0, meaning at pH 4 it is protonated and carries a positive charge, and at pH 8 it is deprotonated, leading to a net charge of 0.

Which of the Following Amino Acids Has a Net Charge