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True statement concerning the peptide shown below Val-Cys-Glu-Ser-Asp-Arg-Cys

True statement concerning the peptide shown below Val-Cys-Glu-Ser-Asp-Arg-Cys

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Answer #1

A. The peptide contains glutamine.
B. The peptide contains a side chain with a secondary amino group.
C. The peptide contains a majority of amino acids with side chains that would be positively charged at pH 7.
D. The peptide is able to form an internal disulfide bond.

D. The two cysteine residues can, under oxidizing conditions, form a disulfide bond. Glutamine's 3-letter abbreviation is Gln. Proline (Pro) contains a secondary amino group. Only one (Arg) of the seven would have a positively charged side chain at pH 7.

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