1.

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

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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