Which of the following amino acid residues would not provide a side chain for acid-base catalysis at physiological pH? (Assume pK values of each amino acid are equal to the pK value for the free amino acid in solution. )
(I) leucine
(II) lysine
(III) aspartic acid
(IV) histidine
A) I,II,III
B) I,II
C) I
D) II
E) I,III
Correct Answer:
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