Given a tripeptide Cys-His-Lys,    Cys: Pk1 = 1.71; Pk2 = 10.78; PkR = 8.33   His: Pk1 = 1.82; Pk2 = 9.17; PkR = 6.0 Lys: Pk1 = 2.18; Pk2 = 8.95; PkR = 10.53   draw the protonic equilibria for the tripeptide what is the IpH? What is the dominant structure at pH 2.0?

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