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Non-Ionizable Vs. Ionizable R-Groups

3. Amino Acids / Non-Ionizable Vs. Ionizable R-Groups / Problem 4

Problem 4

If the pKa of an amino acid's R group is 4.0, what is the likely charge of the R group at pH 7?

A

Cannot be determined

B

Positively charged

C

Negatively charged

D

Uncharged