Biology Practice Problems Proteins Practice Problems Solution: Which one of the tripeptides below:A. is most nega...

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Solution: Which one of the tripeptides below:A. is most negatively charged at pH 7?B. contains sulfur?C. will have the greatest light absorbance at 280nm?D. contains the largest number of nonpolar R groups?

Problem

Which one of the tripeptides below:

A. is most negatively charged at pH 7?

B. contains sulfur?

C. will have the greatest light absorbance at 280nm?

D. contains the largest number of nonpolar R groups?

Solution

A. The most negatively charged tripeptide should have the most number of acidic side chains as these substituents would have already lost their protons at pH 7. D. Asp-His-Glu (2 acidic amino acids)

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