Aspartic acid is a polypeptide side chain found in proteins. The pKa of aspartic acid is 3.86. If this polypeptide were in an aqueous solution with a pH of 7, the side chain would have what charge? a) negative b) positive c) neutral d) there is no way to know
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Ответ:
a) Negative
Explanation: According to the question: The pKa of aspartic acid is 3.86.
For acidic amino acids,
pH > pKa
When side chains are negatively charged, amino acid will be acidic
pH < pKa
That is, when side chains are uncharged, amino acid will be neutral
For aspartic acid, when this polypeptide were in an aqueous solution with a pH of 7
pH (7.0) > pKa (3.86)
Therefore the chains are negatively charged
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