Question

If the net charge of an amino acid under physiological conditions is negative, then the amino acid is a
a) Acidic
b) Basic
c) Neutral
d) None of the above

Answer 1

Explanation:

Among the 20 common amino acids, five have a side chain which can be charged. At pH=7, two are negative charged: aspartic acid (Asp, D) and glutamic acid (Glu, E) (acidic side chains), and three are positive charged: lysine (Lys, K), arginine (Arg, R) and histidine (His, H) (basic side chains