ch369_f09_pract_ex3 - Chemistry 369 Practice exam#3 Fall...

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Chemistry 369 Practice exam #3 Fall 2009 1) (a) (2 points) In the first step of the glycolysis pathway, the enzyme hexokinase catalyzes the conversion of glucose to __________________________________ . (b) (2 pts) Does hexokinase also catalyze the reverse reaction? (circle one) yes no 2) (2 points) Draw the chemical structure for pyruvate in solution at pH 7. 3) (2 points) In the overall 10-step glycolysis reaction, glucose is oxidized to pyruvate. Since this is an oxidation/reduction reaction, something must be getting reduced. Name a molecule that is reduced in the overall glycolysis reaction. 4) (2 points) Fill in the blank. In the first step of the gluconeogenesis pathway, ________________________________ is converted to oxaloacetate, which is later converted to .phosphoenolpyruvate. 5) (2 points) True or false: In the gluconeogenesis pathway, more ATP is produced than is consumed. Circle one: True False 6) In which part of a eukaryotic cell do the following processes occur? (1 point each) a) glycolysis: b) glyconeogenesis: c) pentose phosphate pathway: d) acetyl CoA production by the pyruvate dehydrogenase complex (PDC): e) citric acid cycle (or TCA cycle):
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7) (2 points) Which the following processes are anaerobic? Circle all that apply. pentose phosphate pathway glycolysis gluconeogenesis oxidative phosphorylation 8) (2 points) In terms of chemical structure, how does NADPH differ from NADH? 9) (2 points) Of NAD+ and NADH, which is the more reduced molecule? 10) (2 points) Fill in the blank. Converting pyruvate to lactate can facilitate glycolysis because lactate formation results in the production of the cofactor _________________ that is required for glycolysis. 11) (2 points) What is one useful product of the pentose phosphate pathway? What is this product a precursor for?
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