Which amino acid has the lowest isoelectric focus point?

Which amino acid has the lowest isoelectric focus point?

a. Lys

b. Arg

c. Gln

d. Asp

Isoelectric focus point or pI is the pH at which a protein has no net charge and does not move in an electric field. Isoelectric focus point basically tells us how acidic or basic a protein is. The more acidic the protein is the lower it's pI is. Therefore, looking at the answer choice we must first determine whether these amino acids are acidic, basic or neutral. Lysine is a basic amino acid and therefore should have a high pI. Arginine is also basic and should also have a high pI. Glutamine is a polar neutral amino acid, and thus can be eliminated. Aspartate is an acidic amino acid and must have a low pI. Therefore, choice D is the correct answer.

To consult with an amazing chemistry and biochemistry tutors in NYC and online, contact us here.



Recent Posts

See All

Live Online Chemistry Classes

Transformation Tutoring is happy to offer live online group chemistry classes for the 2020-2021 school year. Classes are : Honors SAT Subject Chemistry and Introduction to Organic Chemistry. Classes w