Which describes the isoelectric point of an amino acid?

Question

Quizplus · Accepted Answer

The isoelectric point (pI) of an amino acid is the pH at which it has no net charge, meaning that the number of positive charges (from its amino group) equals the number of negative charges (from its carboxyl group). At pH values below its pI, the amino acid will have a net positive charge, while at pH values above its pI, the amino acid will have a net negative charge. The degree of ionization of the amino acid at pH 7 may be related to its pI, but it is not the same thing. Additionally, the notion of an electric field is not needed to describe the pI. Finally, while the amino acid may have a maximal charge at a certain pH value, this does not necessarily correspond to its pI.

Which Describes the Isoelectric Point of an Amino Acid