Which of the following statements is true of the isoelectric point of amino acids?
A) It is the same for all amino acids.
B) It is the pH at which an amino acid conducts electricity.
C) It is the pH at which an amino acid has equal numbers of positive and negative charges.
D) All of these statements are true.

Question

Quizplus · Accepted Answer

The isoelectric point (pI) of an amino acid is the pH at which it has no net charge (equal numbers of positive and negative charges). Each amino acid has a unique pI value based on the properties of its side chain. Therefore, statement A is false. Statement B is incorrect because the isoelectric point has nothing to do with the ability of an amino acid to conduct electricity. Therefore, the correct answer is C.

Which of the Following Statements Is True of the Isoelectric