Which of the Following is a Negatively Charged Amino Acid

Question

Which of the following is a negatively charged amino acid?
A)alanine
B)aspartate
C)glutamine
D)histidine

Accepted Answer

Aspartate is a negatively charged amino acid due to the presence of a carboxyl group that confers a net negative charge at physiological pH. The other amino acids listed either lack a charged side chain or have a positive charge.