Question: You are given a peptide Ala-Cys-Leu that is oxidized to form a disulfide bond with another Ala-Cys-Leu. What is its net charge at pH 12?

You are given a peptide Ala-Cys-Leu that is oxidized to form a disulfide bond with another Ala-Cys-Leu. What is its net charge at pH 12? What is its net charge if the disulfide bonds are reduced?

2) Given the following peptide DAPQGVSK, identify its pl and draw the chemical structure of its zwitterionic form.

3) Does the dipeptide Phe-Trp have the same pl as Tro-Phe? why?

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