The structure depicted below is that of protonated L-glutamic acid. a. NH3 HO Assign the pka values given to three functional groups in this molecule [3] b. Draw the structure of this amino acid at pH=1, pKq = 2.19, 4.25, 9.67 pH=3, pH=7, pH=11 [4] Estimate the net charge (average charge) of this amino acid at pH = 4.25 [2] C. HO =