arginine: pKa 1 = 2.17 (-COOH) ; pKa 2 = 9.04 (-NH2); pKa 3 = 12.48 (R group)
pH > pKa → deprotonate
pH < pKa → protonate
Which of the following best describes the side chain of arginine at a pH of 11?
C. charged and polar
D. uncharged but polar
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