At a physiological pH of 7.4, amino acids exist as zwitterions because the pKa of the -NH3+ group is ________ 7.4, and the pKa of the -COOH group is ________ 7.4.
A) greater than; less than
B) less than; greater than
C) greater than; greater than
D) less than; less than
E) equal to; equal to
Correct Answer:
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