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Final (2009) - U niversity o f H ouston B CHS 3 304 A A...

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University of Houston BCHS 3304 A Briggs May8,zooqP'int.a-N;e- Adil r Aisho- Final Exam (B) Instructor Dr. Answer ALL questions. LAST, FIRST Multiple choice 2 pts each (100 pts total) - Choose the most correct answer and fill it in on the Scantron sheet. Please look at the last pages of the exam. There, you will find a table of half reactions, the gas constant, a Ramachandran diagram, and graph paper. Also circle your answer on the exam and show ALL work. That will help me reconcile your Scantron with your exam, if necessary. 1). The diagram represents a'osubstrate cycle" or "futile cycle" in glucose metabolism. Which of the following statements about the cycle is correct? a). Reactions I & II are catalyzed by the same enzyme and help establish an equilibrium between the two metabolites. b). Reaction II produces ATP by substrate-level phosphorylation. c). Reaction I is involved in the biosynthesis of glucose. @ Reaction I is catalyzedby an allosteric enzyme that is activated by fructose-2-6-bisphosphate. -6-P Fru-1,6-B e). Reaction II occurs under low-energy conditions when the cell needs ATP. -lf.2). Compute the AG' for a reaction with a IQoof 4.56 x l0-5. -F| q. -22.7 kJlmol n -bY 24,800kJ/mol AG = -RTlnK .rx_z+.goo kJ/mol _ ;.ce { @zi.i-utr^or (8.3t'fsxrs3)(rrre) (ln r+"rioxro-s) (e\ -24.8 kJ/mol .,-/ A6.= - p e. ,,oc @ T= O* g - 2 { , 8 Q r E 3 5 o g 3). Mannose can be metabolized through the glycolysis pathway but it must first be converted into mannose-6-phosphate by hexokinaseand then convertedinto fructose-6-phosphate, an intermediate in the glycolysis pathway, by ENZYME B. What is the identity of ENZYME-B? a). Pyruvate Kinase (6) Hexokinase c). Phosphofructokinase ,d). Phosphoglucose isomerase lA Pnorotromannose isomerase V 4). What form of this amino acid cannot exist in the pH range 7-14? H HrN-?-coo- lcHr)+ a). NH, H HrN-?-CoO- lcnz)a b). NH.+ n NH.+-g-6gqg fct')o r NH^+ e). H NH,+-C-COO- - l (CH,)o t - r NH^+ c). LI u \t-^-^n^u ' '2'r Y vvvr ' (CH,)O t - NH, @
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5). Theubiquitous chemistry of acetyl-CoA is centered on its high-energy @ thio"tt"t tt phosphoanhydride [email protected] a). 2R,3R,4R .*tr 25,3R,4R 4f 2R,3S,4R G) 2R,3R,4S .*f,2S,3S,4R G s-+R G s':r R Q n - + 5 AR c l o -^ C\lotr i'o- \ 5 CilzOtl Q e ' s frl ** is the stereochemistry of each of the chiral centers in the following molecule (R or S)? onO o H @ t @ 3R, +S 7). What is the only compound that can phosphorylate the unphosphorylated catalytic histidine residue in phosp{oglycerate mutase (PGM)? ( a\ 2,3 -Bisphosphoglycerate Y;. Z-lhosphoglycerate c). 3-Phosphoglycerate d). 1,3-Bis-phosphoglycerate e). Phosphoenolpynrvate
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