Proteins are able to act as buffers because their -COOH groups can ________, and their -NH2 groups can ________.
A. release H+ when pH is decreased; bind H+ when pH is elevated
B. bind H+ when pH is decreased; release H+ when pH is elevated
C. release H+ when pH is elevated; bind H+ when pH is decreased
D. bind or release H+ when pH is decreased or elevated; bind or release H+ when pH is decreased or elevated
Answer: C
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