The two amino acids having R groups with a negative net charge at pH 7.0 are ___________
(a) Aspartate and glutamate
(b) Arginine and histidine
(c) Cysteine and methionine
(d) Proline and valine
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I would like to ask this question from Amino Acids topic in chapter Amino Acids, Peptides and Proteins of Biochemistry