Exam2Vrs2_key - March 10th 2009 CH369 Exam 2 VERSION 2 NAME...

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March 10 th , 2009 CH369 Exam 2 VERSION 2 NAME: UTEID: Instructions: 1. Please bubble in your name, UTEID and the version number of your exam on the scantron sheet. 2. Version number should be filled in under the “GRADE OR EDUC” section. (01) 3. Answers 1-35 must be marked on the scantron sheet. Only the scantron sheet will be graded. 4. Questions 36 - 41 should be answered on THIS EXAM. 5. All requests for addition errors or regrading must be made within 1 week of receiving your exam. No exceptions! 6. Addition errors and regarding questions 36-41 should be taken to the TA. Any exam turned in for regrade will be completely regraded.
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Section Points I (#1 - 10) 10 II (#11 - 35) 50 III (#36 – 41) 40 Total 100 Section I. (1pt. each) 1. A serine protease is a peptide-hydrolyzing enzyme, where a histidine residue acts as an acid-base catalyst. a. True b. False 2. ABO blood type is determined by the presence of a terminal galactose or N-acetylated galactose in the oligosaccharide component of the red blood cell glycoproteins. a. True b. False 3. An enzyme catalyzes a reaction by changing the free energy difference between
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reactants and products. a.True b.False 4. In eukaryotes, citric acid cycle occurs in the cytosol. a.True b.False 5. During starvation (when stored glycogen is depleted), the amino acids can be converted to glucose. a. True b. False 6. The type of glycosidic bond in cellulose is α (1 4) linkage. a. True b. False (7-10) Use the choices below for the following questions. A) Reduction B) Ubiquinone C) Oxidation D) Heterotrophs E) Glucose F) Photoautotrophs G) Fatty Acids H) NADP+ I) NAD+ J) Ubiquitin
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7. Major source of energy for central nervous system E 8. Anabolic reaction A 9. Tag on a protein destined for degradation J 10. Cofactor that is essential for anabolic reactions H Section II. (2pt. each) 11. Which is the net equation of glycolysis as it occurs in brain cells under aerobic conditions? a. Glucose + 2 ADP + 2 P i 2 lactate + 2 ATP + 2 H + b. Glucose + 2 ADP + 2 P i + 2 NAD + 2 pyruvate + 2 ATP + 2 NADH + 4 H + c. Glucose + 2 ADP + 2 P i 2 CH 3 CH 2 OH + 2 CO 2 + 2 ATP d. Glucose + 2 ADP + 2 P i + 2 NAD + 2 lactate + 2 ATP + 2 NADH + 4 H + e. Glucose + 2 ATP 2 lactate + 2 ADP + 2 P i
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12. Phosphofructokinase is inhibited by high concentrations of . 13. E. coli ribonuclease HI is an enzyme that catalyzes the hydrolysis of phosphodiester bonds in RNA. Its catalytic mechanism is shown as below. In this diagram, histidine 124 acts as a(an) catalyst. a. acid b. base c. covalent d. metal
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