According to the Diagram, Which PH is the One at Which

Question

According to the diagram, which pH is the one at which this amino acid will have a net charge of 0? 
A) 11 
B) 6 
C) 1.5 
D) 1 
E) 0.5

Accepted Answer

At pH 6, the amino acid will have a net charge of 0 as it is the isoelectric point where the number of positive charges (from the amino group) equals the number of negative charges (from the carboxyl group). At pH values below 6, the amino acid will have a net positive charge, and at pH values above 6, the amino acid will have a net negative charge. Therefore, choices A, C, D, and E are incorrect.