Biochem Final Exam Answers

Biochem Final Exam Answers - 99:110 Final Exam Form A May...

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99:110 Final Exam Form A May 7, 2007 Use these to answer questions 1 –10. Each letter may be used once, more than once or not at all. a. glycolysis b. gluconeogenesis c. pentose phosphate pathway d. glycogen synthesis e. glycogen degradation f. citric acid cycle g. oxidative phosphorylation h. photosynthesis i . β oxidation j. fatty acid synthesis 1. __ c. pentose phosphate pathway __ is only regulated by the demand for its products, NADPH and ribose. 2. __ a. glycolysis __ is an ancient pathway that breaks down hexoses for energy whether or not oxygen is present. 3. _d. glycogen synthesis _ requires an activated form of glucose for its repeated reactions. 4. __ b. gluconeogenesis __ uses several bypass reactions to reverse steps in the pathway which otherwise shares enzymes with it. 5. __ e. glycogen degradation __ is particularly efficient for making glucose useful because phosphorolysis saves an ATP. 6. ____ j. fatty acid synthesis _ occurs in the cytoplasm of cells where NADPH is abundant and uses an acyl CoA. 7. __ i . β oxidation __ yields the largest number of ATPs for every carbon oxidized. 8. __ f. citric acid cycle __ can both oxidize many fuels and provide intermediates for several synthetic pathways. 9. __ h. photosynthesis __ has an electron transport chain that is driven by light energy. 10. __ g. oxidative phosphorylation ___ requires an intact membrane and oxygen to make ATP. 11. Jimmy has a birthday and eats five pieces of birthday cake. Which of the ingredients can Jimmy’s body make into triacylglycerides? a. canola oil b. sugar c. flour d. eggs e. a and b f. a, b and c g. all of the ingredients 12. The new detergent promises extra clean clothes because it has enzymes! Which of these enzymes might it have? a. Cellulases from very clean snails b. Chymotrypsin from pig stomach c. Proteases from a hot springs organism d. Phosphorylases from bacteria e. a and b f. a, b and c 1
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Use these to answer questions 13 – 22. Each letter may be used once, more than once or not at all. a. ketone body synthesis b. cholesterol synthesis c. nitrogen fixation d. transamination e. urea cycle f. insulin g. glucagon h. liver cells i. adipocytes j. muscle cells 13. ____ g. glucagon ____ is the hormone that co-ordinates the body’s response to fasting and starvation. 14. ___ b. cholesterol synthesis __ provides sterol backbones for steroid hormone synthesis. 15. a. ketone body synthesis __ provides fuel for the brain during fasting. 16. c. nitrogen fixation __ is energetically very expensive and organisms that do it are key to the ecology. 17. ________ e. urea cycle ___ shares intermediates with the citric acid cycle and helps dispose of excess nitrogen. 18.
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This note was uploaded on 04/12/2008 for the course BIOCHEM 099:100 taught by Professor Fulton during the Spring '07 term at University of Iowa.

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Biochem Final Exam Answers - 99:110 Final Exam Form A May...

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