Amino acids, such as glycine, are the key building blocks of proteins and will be discussed in greater detail in Chapter 25. At the pH of the stomach, glycine exists predominantly in aprotonated form in which there are two acidic protons of interest. The pK_avalues for these protons are shown. Using this information, draw the form of glycine that will predominate at physiological pH of 7.4.

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нн pk, = 9.87 pK, = 2.35 o-H Glycine