If the side chains of amino acids contain carboxyl (-COOH) groups,they
A) contribute a positive charge to the amino acid at pH 10.
B) contribute a negative charge to the amino acid at pH 10.
C) have no effect on the charge of the amino acid at pH 10.
D) are considered acidic amino acids.
E) contribute a negative charge to the amino acid at pH 10 AND are considered acidic amino acids.
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