Fall 10 - Name CHEM 340 Biochemistry I Exam 4 A ns w er KEY...

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Name: _________________________________________________________________________________________________________________ 1 CHEM 340: Biochemistry I-Exam 4 Answer KEY December 10, 2010 Part I: “Please let it be this one…” For Questions 1-20, select the single best answer. Please mark your answers on both the Scantron card and your exam. (2.5 pts. each) 1) The reference compound for naming D and L isomers of sugars is: a) fructose. b) glucose c) glyceraldehyde d) ribose 2) When two carbohydrates are epimers: 3) How many epimeric pairs are in Figure 1 (see additional handout) 4) How many isomeric forms does compound 2 in Figure 1 have? 5) From the abbreviated name of the disaccharide Gal( β 1 4) Glc, we know that: a) C-4 of Glc is joined to C-1 of Gal by a glycosidic bond. b) the compound is a D-enantiomer. c) the Gal residue is at the reducing end. d) The Glc residue is in its pyranose form. 6) Which compound in Figure 2 is a non-reducing sugar? 7) Which of the following is not necessarily a feature common to all metabolic pathways?
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Name: _________________________________________________________________________________________________________________ 2 8) Glycolysis can occur in the absence of oxygen because of: 9) Which of the cofactors below participates directly in most of the redox reactions that occur in the conversion of glucose to lactate? a) ADP b) FAD/FADH 2 c) Glyceraldehyde 3-phosphate d) NAD + /NADH 10) The first reaction in glycolysis that results in the formation of a high-energy compound is catalyzed by: 11) Inorganic fluoride inhibits enolase. In an anaerobic system that is metabolizing glucose, which of the following compounds should one expect to increase in concentration following the addition of fluoride? 12) Other than protecting its DNA, what is the most important, general metabolic goal of a cell?
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