11. In the enzyme catalyzed reaction sequence below, can the E-PO4 intermediate be predicted and why? (A) Yes, the mechanism is a double-displacement reaction. (B) Yes, the reaction fits the ping-pong model. (C) No, the reaction is random single-displacement. (D) No, the reaction is double-displacement. (E) No, the reaction is order single-displacement.

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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