If the Side Chains of Amino Acids Contain Carboxyl (-COOH)

Question

If the side chains of amino acids contain carboxyl (-COOH) groups, they
A) contribute a positive charge to the amino acid at pH 10 AND are considered acidic amino acids.
B) contribute a negative charge to the amino acid at pH 10 AND are considered nucleic acids.
C) contribute a positive charge to the amino acid at pH 10 AND are considered nucleic acids.
D) contribute a negative charge to the amino acid at pH 10 AND are considered acidic amino acids.
E) contribute a negative charge to the amino acid at pH 10 AND are considered acidic monosaccharides.

Accepted Answer

Carboxyl (-COOH) groups have an acidic nature and therefore contribute a negative charge to the amino acid at pH 10. Amino acids containing carboxyl groups are considered acidic amino acids.