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Tripeptide1: Tyr-Lys-Met
Tripeptide2: Gly-Pro-Arg
Tripeptide3: Asp-Trp-Tyr
Tripeptide4: Asp-His-Glu
Tripeptide5: Leu-Val-Phe

Which one of the above tripeptides:
a. is most negatively charged at pH7
b. contains the largest number of nonpolar R groups
c. contains sulfur
d. will have the greatest light absorbance at 280 nm

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