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 soluti

Question

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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Dulcie 2 months 2021-07-31T17:31:46+00:00 1 Answers 4 views 0

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    2021-07-31T17:33:33+00:00

    Answer: 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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