F08 LS1a Pset 3fkeyst-2

F08 LS1a Pset 3fkeyst-2 - Name: TF Name: LS1a Fall 08...

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Name: TF Name: 1 LS1a Fall 08 Problem Set #3 Due Monday 10/13 at noon in your TF’s drop box on the 2 nd floor of the Science Center All questions should be turned in. 1. (20 points) Consider the reaction energy diagram shown below. (a) On the diagram, indicate the following: The free energy levels of substrate (S) and product (P) (2 points) Δ (2 points) Δ rxn (2 points) The location(s) of any transition states (TS) (2 points) (b) Is this reaction thermodynamically favorable or unfavorable as shown? (6 points) The reaction is thermodynamically unfavorable as shown ( G°rxn is positive). (c) Is the reverse reaction thermodynamically favorable or unfavorable? Briefly explain. (6 points) Favorable – goes from higher free energy to lower free energy.
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Name: TF Name: 2 2. (28 points) Plants incorporate carbon by combining atmospheric carbon dioxide (CO 2 ) with Ribulose 1, 5-bisphosphate. However Ribulose 1, 5-bisphosphate can react with either CO 2 or O 2 as shown in the reactions below. In the first reaction carbon is incorporated into the plant, while in the second reaction carbon is gradually lost to the environment. k f1 k r1 1. Ribulose 1, 5-bisphosphate + CO 2 2 3-phosphoglycerate 2. Ribulose 1, 5-bisphosphate + O 2 3-phosphoglycerate + Phosphoglyoxylate k f2 k r2 (a) Write the forward and reverse rate expression for the two chemical reactions. (8 points) Forward rate
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F08 LS1a Pset 3fkeyst-2 - Name: TF Name: LS1a Fall 08...

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