midterm1w03blandkey

midterm1w03blandkey - BIS103-002 - FIRST MIDTERM January...

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BIS103-002 -- FIRST MIDTERM January 30, 2003 Name_____________________________________________ 1 Student ID # _______________________________________ Check the appropriate boxes below Undergraduate Graduate Audit Completing Incomplete Note: There are 5 questions and a total of 8 numbered pages counting 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 14 3 16 4 33 5 21 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 Δ G o ' for the reaction ADP + P i ATP + H 2 O = + 30.5 kJ x mole -1 Δ G o ' = - n F Δ E o ' Δ G = Δ 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 January 30, 2003 Name_____________________________________________ 2 1. (16 pts). For each of the following statements, state whether the statement is TRUE (T) or FALSE (F) by circling the correct word. If the statement is FALSE, briefly explain why in the space provided, and WRITE a correct statement. If the statement is correct, explain why. . (a). TRUE FALSE A reaction with a positive G 0’ can proceed. (b). TRUE FALSE When G 0’ is positive, Keq’>1 (c). TRUE FALSE When G 0’ = 0, Keq’ =1 (d). TRUE FALSE The spontaneous direction of a reaction always results in an increase in the entropy of the products. 2. (14 pts) Glycogen and Glycogen Metabolism (a) (4 pts.) Give two reasons why phosphorolytic cleavage of muscle glycogen is more advantageous than hydrolytic cleavage. Reason 1: Reason 2: (b). A glycogen molecule is shown below. Answer the following questions about this fragment. Each residue is indicated with a capital letter.
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BIS103-002 -- FIRST MIDTERM January 30, 2003 Name_____________________________________________ 3 i. (2 pts). Which residue(s) are at the non-reducing end? ii. (2 pts). Which residue(s) are at the reducing end? iii.(2 pts). An α -1,6-glycosidic linkage occurs between which two residues? iv. (2 pts). An α -1,4-glycosidic linkage occurs between which two residues? v. (2 pts). Is this a substrate for phsophorylase? YES NO (circle one). If yes, indicate which residues are cleaved off. If not, briefly explain why. 3. 16 pts (a). (8 pts). When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25°C with the enzyme that inter-converts the two, the final equilibrium mixture contains 1% 3-phosphoglycerate. Calculate the Keq and G 0’ for the reaction in the glycolytic direction. For full credit you must show your work in the space provided below.
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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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midterm1w03blandkey - BIS103-002 - FIRST MIDTERM January...

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