Fall 10 - Name: _ CHEM 340: Biochemistry I - Exam 4 A ns w...

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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: a) one is a pyranose and the other is a furanose. b) one is an aldose and the other is a ketose. c) they differ in length by one carbon. d) they differ in the configuration around one carbon atom. 3) How many epimeric pairs are in Figure 1 (see additional handout) a) 0 b) 1 c) 2 d) 3 e) 4 4) How many isomeric forms does compound 2 in Figure 1 have? a) 16 b) 8 c) 4 d) 2 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? a) 1 b) 2 c) 3 d) None of them is. 7) Which of the following is not necessarily a feature common to all metabolic pathways? a) They utilize carbohydrates. b) They can only proceed in one direction in a cell. c) They have one or more steps that drives the entire pathway forward. d) They are controlled by specific chemical reactions and enzymes within the pathway.
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Name: _________________________________________________________________________________________________________________ 2 8) Glycolysis can occur in the absence of oxygen because of: a) situation. b) fermentation. c) hibernation. d) constipation. 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: a) hexokinase b) phosphofructokinase-1 c) glyceradehyde 3-phosphate dehydrogenase d) triose phosphate isomerase 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? a) 2-phosphoglycerate b) glucose c) phosphoenolpyruvate d) pyruvate 12) Other than protecting its DNA, what is the most important, general metabolic goal of a cell? a) Keeping its glucose levels high. b) Maintaining a constant supply and concentration of ATP. c)
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Fall 10 - Name: _ CHEM 340: Biochemistry I - Exam 4 A ns w...

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