Which statement is TRUE about the pKa values for ionizable R-group of amino acids within a polypeptide?
A) The pKa values for R-groups do not change from free amino acids.
B) The pKa values for R-groups are 1 pH unit higher than free amino acids.
C) The pKa values for R-groups are 1 pH unit lower than free amino acids.
D) The pKa values for R-groups vary depending on the local environment of the side chain.
E) The pKa values for R-groups depend on how close the R-group is to the N- or C-terminus of the polypeptide.
Correct Answer:
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