Chapter 21, Problem 49E

Interpretation Introduction

Interpretation: The following acids in its dipolar ion form:

(a) Thr

(b) Ala

(c) Leu

(d) Lys

Concept Introduction:

Although we usually write the structures of amino acids as neutral, their actual structure is ionic and depends on the pH. In general, amino acids undergo an intramolecular acid–base reaction to form a dipolar ion or a zwitterion.