According to the diagram, which estimate is BEST of this amino acid's isoelectric point?

Question

Quizplus · Accepted Answer

The isoelectric point (pI) is the pH at which a molecule carries no net electrical charge. From the diagram, we can estimate that the pI of this amino acid is between pH 5 and pH 7, which means it is closer to a neutral pH of 7. The closest option is D) 6, which is a reasonable estimate for the pI based on the given information. The other options are either too low or too high to be the best estimate for the pI.

According to the Diagram, Which Estimate Is BEST of This