Arginine is the most basic of the 20 amino acids because its side chain is ________ under most cell conditions.
A)very highly charged
B)hydrophobic
C)titrated
D)protonated
E)negatively charged

Question

Quizplus · Accepted Answer

The side chain of arginine contains a guanidinium group (-NH-C(=NH)-NH2+) which is protonated under physiological pH conditions, making arginine the most basic of the 20 amino acids.

Arginine Is the Most Basic of the 20 Amino Acids