midterm1fromw04key

midterm1fromw04key - BIS103-002 - FIRST MIDTERM February 5,...

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BIS103-002 -- FIRST MIDTERM February 5, 2004 Name_____________________________________________ 1 Student ID # _______________________________________ Check the appropriate boxes below Undergraduate Graduate Audit Completing Incomplete Note: There are 6 questions and a total of 11 numbered pages including the cover sheet. A blank sheet is included in the back for scratch paper and to cover your exam. Do not use this paper for your answers. If you need more room use the back of the numbered pages. Partial credit will be given. WRITE YOUR NAME ON THE TOP OF EACH PAGE. Question Value Score 1 16 2 20 3 30 4 16 5 8 6 10 TOTAL 100 T= 298º K R= 8.315 J x mol -1 x K -1 Faraday's constant (F) is 96.5kJ x volt -1 x mol -1 G o ' for the reaction ADP + P i ATP + H 2 O = + 30.5 kJ x mole -1 G o ' = - n F E o ' G = G o ' + RT ln [products/reactants] I, ______________________________, authorize the University to distribute publicly this graded exam ( e.g. , handed out in class, or left in a bin for me to pick up). Signature ________________________________________ Date _____________________
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BIS103-002 -- FIRST MIDTERM February 5, 2004 Name_____________________________________________ 2 1. (16 pts). Inside certain microorganisms, sucrose phosphorylase catalyzes the phosphorolytic cleavage of sucrose in the reaction described below: Some useful information: a). (4 pts). What is the standard free-energy change for the phosphorolysis of sucrose? For complete credit, you must show your work. To solve this, you must reverse the second reaction above and its G 0 , then add the G 0 ’s together. b). (4 pts). Calculate the equilibrium constant for the phosphorolysis of sucrose at 25°C. For complete credit, you must show your work. Show your starting equation. Use the equation: G 0 = - RT lnKeq (which can be derived from the equation given on the first page). Substitute in: T=298, R= 8.315 and G 0 = -8,600J/mol -8,600J/mol = - (8.315) (298) ln Keq 3.47 = lnKeq e 3.47 = Keq Keq = 32 SUCROSE + HPO 4 2- GLC-1-P + FRUCTOSE SUCROSE + H 2 O GLUCOSE + FRUCTOSE G 0' = -30.2 kJ/mol GLUCOSE-1-P + H 2 O GLUCOSE + HPO 4 2- G 0' = -21.6 kJ/mol GLUCOSE-1-P + H 2 O SUCROSE + H 2 O GLUCOSE + FRUCTOSE G 0' = -30.2 kJ/mol GLUCOSE + HPO 4 2- G 0' = +21.6 kJ/mol SUCROSE + HPO 4 2- GLC-1-P + FRUCTOSE G 0' = -8.6 kJ/mol
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BIS103-002 -- FIRST MIDTERM February 5, 2004 Name_____________________________________________ 3 c). (4 pts). What effect would the presence of additional sucrose phosphorylase enzyme have on the G of the reaction? The G 0’ None, none. Enzymes do not affect the free energy change of reactions, they only increase the rate at which equilibrium is reached. d).
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This note was uploaded on 06/17/2009 for the course BIS 103 taught by Professor Abel during the Spring '08 term at UC Davis.

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midterm1fromw04key - BIS103-002 - FIRST MIDTERM February 5,...

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