What charged group(s) are present in glycine at a pH of 7? A) -NH₃⁺ B) -COO^- C) -NH₂⁺ D) A and B E) A, B, and C

Question

Quizplus · Accepted Answer

At a pH of 7, the amino group (-NH3+) on glycine will be protonated (positive charge) since the pH is lower than the pKa of the amino group (~9.6). The carboxyl group (-COOH) will be deprotonated (negative charge) since the pH is higher than the pKa of the carboxyl group (~2.2). Therefore, the charged groups present at pH 7 are -NH3+ and -COO-, as represented in choice D.

What Charged Group(s) Are Present in Glycine at a PH