Proteins can buffer a drop in pH by their _____ side groups and can buffer an increase in pH by their _____ side groups.

Proteins can buffer a drop in pH by their _____ side groups and can buffer an increase in pH by their _____ side groups. 



A. -NH2; -PO4
B. -PO4; -COOH
C. -NH2; -COOH
D. -COOH; -NH2
E. -PO4; -NH2


Answer: C. -NH2; -COOH


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