Consider a reaction that produces a significant amount of H+ and is to be carried out at pH 7.1. Only two acids are available for making the buffer solution. The pKa values for acids A and B are 6.0 and 7.3, respectively. Which acid would serve as the optimum buffer for this reaction? a) acid A. b) acid B. c) water, d) both acids would be equally effective What CHARGED group(s) are present in serine at a pH of 1? The two pKa for serine is 2.21 and 9.15 a)NH_3^+ b) COO” c) NH_2 d) COOH e) a and d The peptide bond a) is usually found in the cis conformation b) has free rotation angle of phi and psi c) is longer than a typical single bond but shorter than a double bond d) The six atoms of the peptide bond group are planar. e) all of the above