22. When a cell with the pentose phosphate pathway has a need for more pentose phosphates, but not for additional NADPH: (A) Glucose-6-phosphate dehydrogenase is activated. (B) The oxidative and non-oxidative enzymes of the pentose phosphate pathway are active. (C) The non-oxidative enzymes produce pentose phosphates from fructose-6-phosphate and glyceraldehyde-3-phosphate. (D) All enzymes of glycolysis and the pentose phosphate pathway are active. (E) None of the above is true.

1. Compare the two reaction coordinate diagrams below and select the answer that correctly describes their relationship. In eachcase, the single intermediate is the ES complex.Free energy, (A) Diagram (a) describes a strict "lock and key" model, whereas diagram (b) describes a transition-state complementarity model. (B) The activation energy for the catalyzed reaction is #5 in diagram (a) and is #7 in diagram (b). (C) The activation energy for the uncatalyzed reaction is given by #5 + #6 in diagram (a) and by #7 + #4 in diagram (b). (D) The contribution of binding energy is given by #5 in diagram (a) and by #7 in diagram (b). (E) The ES complex is given by #2 in diagram (a) and #3 in diagram (b).

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