Question

The isoelectric point of an amino acid is 6.0. If the amino acid is dissolved in a buffer of Ph 7.0 it will
a) have a net positive charge
b) be electrically neutral
c) have a net negative charge
d) have no negatively charged groups
e) none of the above

Answer 1

Answer:

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).