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The two amino acids having R groups with a negative net charge at pH 7.0 are ___________

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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

I have been asked this question in homework.

I would like to ask this question from Amino Acids topic in chapter Amino Acids, Peptides and Proteins of Biochemistry

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Best answer
The correct option is (a) Aspartate and glutamate

The best explanation: Aspartate:  H3 N^+ – CH( CH2 COO^–) – COO^–

Glutamate:  H3 N^+ – CH( C2 H4 COO^–) – COO^–.

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