UCLA CHEM 153A - 5Pages from Final_153A_2004_correctd (5 pages)

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5Pages from Final_153A_2004_correctd



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5Pages from Final_153A_2004_correctd

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Pages:
5
School:
University of California, Los Angeles
Course:
Chem 153a - Biochemistry: Introduction to Structure, Enzymes, and Metabolism
Biochemistry: Introduction to Structure, Enzymes, and Metabolism Documents
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Name Student ID Chemistry 153A 2 Final Examination Spring 2004 Prof J S Valentine There are 15 pages total Be sure that you have all pages and that you have put your name on all pages Answer all questions in the space provided Answers written elsewhere will not be graded Multiple choice questions must be answered on p 3 Look over the entire exam before you start Be sure you leave yourself enough time to answer all the questions that you know first Good luck Questions Points Part I Multiple Choice 40 Part II Short Answer 60 Part III Extra Credit 8 Total 100 G H T S G n E Keq e G RT Your Score G RT lnK eq G G RT ln products reactants E E acceptor E donor Gt RT ln C2 C1 z aA A A Henderson Hasselbach pH pKa log A HA Nernst Go nF Eo v0 Vmax S Km S 1 KM 1 Vo Vmax S Vmax Avogadro s number N 6 022 x 1023 mol Boltzmann constant k 1 381 x 1023 J K Faraday s constant 96 480 J V x mol Gas constant R 8 314 J mol K 1 Name APPROXIMATE pKa VALUES OF IONIZABLE AMINO ACIDS AND PEPTIDE GROUPS GROUP pKa carboxyl of free amino acid 2 amino of free amino acid 9 6 3 C terminal carboxyl N terminal amino 8 R group of Asp 4 R group of Glu 4 R group of His 6 R group of Cys 8 5 R group of Tyr 10 R group of Lys 10 5 R group of Arg 12 5 2 Name Record your answers to the multiple choice questions on this page 1 A B C D E 2 A B C D E 3 A B C D E 4 A B C D E 5 A B C D E 6 A B C D E 7 A B C D E 8 A B C D E 9 A B C D E 10 A B C D E 11 A B C D E 12 A B C D E 13 A B C D E 14 A B C D E 15 A B C D E 16 A B C D E 17 A B C D E 18 A B C D E 19 A B C D E 20 A B C D E 3 Name Part I Multiple Choice 2 points each 1 Enzymes are potent catalysts because they A are consumed in the reactions they catalyze B are very specific and can prevent the conversion of products back to substrates C drive reactions to completion while other catalysts drive reactions to equilibrium D increase the equilibrium constants for the reactions they catalyze E lower the activation energy for the reactions they catalyze 2 In competitive inhibition an inhibitor A binds at several different sites on an enzyme B binds covalently to the enzyme C binds only to the ES complex D binds reversibly at the active site E lowers the characteristic Vmax of the enzyme 3 When the linear form of glucose cyclizes the product is a n A anhydride B glycoside C hemiacetal D lactone E oligosaccharide 4 Which of the following is not a reducing sugar A Fructose B Glucose C Glyceraldehyde D Ribose E Sucrose 5 Which of the following best describes the cholesterol molecule A Amphipathic B Nonpolar charged C Nonpolar uncharged D Polar charged E Polar uncharged 4 Name 6 An integral membrane protein can be extracted with A a buffer of alkaline or acid pH B a chelating agent that removes divalent cations C a solution containing detergent D a solution of high ionic strength E hot water 7 The G values for the two reactions shown below are given Oxaloacetate acetyl CoA H2O Oxaloacetate acetate citrate lyase citrate CoASH citrate synthase citrate G 32 2 kJ mol G 1 9 kJ mol What is the G for the hydrolysis of acetyl CoA acetyl CoA H2O acetate CoASH A 34 1 kJ mol B 32 2 kJ mol C 30 3 kJ mol D 61 9 kJ mol E 34 1 kJ mol 8 Which of the following statements is incorrect A Aerobically oxidative decarboxylation of pyruvate forms acetate that enters the citric acid cycle B In anaerobic muscle pyruvate is converted to lactate C In yeast growing anaerobically pyruvate is converted to ethanol D Reduction of pyruvate to lactate regenerates a cofactor essential for glycolysis E Under anaerobic conditions pyruvate does not form because glycolysis does not occur 9 Which of the following is not true of the citric acid cycle A All enzymes of the cycle are located in the cytoplasm except succinate dehydrogenase which is bound to the inner mitochondrial membrane B In the presence of malonate one would expect succinate to accumulate C Oxaloacetate is used as a substrate but is not consumed in the cycle D Succinate dehydrogenase channels electrons directly into the electron transfer chain E The condensing enzyme is subject to allosteric regulation by ATP and NADH 5


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