MCQ – 86350

Question

An investigator studying epigenetic mechanisms isolates histone proteins, the structural motifs involved in DNA binding and regulation of transcription. The peptide bonds of histone proteins are hydrolyzed and one type of amino acid is isolated. At normal body pH, this amino acid has a net charge of +1. The investigator performs titration of this amino acid and obtains the graph shown. The isolated amino acid is most likely which of the following:

A.

Serine

B.

Lysine

C.

Aspartate

D.

Histidine

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