Under physiological conditions, amino acids in solution carry A)no electrical charges. B)a net positive charge, due to an −NH ₃ ⁺ group or groups. C)a net negative charge, due to a −COO ⁻ group or groups. D)both −NH ₂ and −COOH groups. E)both −NH ₃ ⁺ and −COO ⁻ groups.

Question

Quizplus · Accepted Answer

Amino acids have both amino (-NH2) and carboxyl (-COOH) groups, which can ionize to form -NH3+ and -COO- groups, respectively, in solution. Therefore, amino acids in solution carry both positive and negative charges, making choice E the correct answer.

Under Physiological Conditions, Amino Acids in Solution Carry