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SI session Oct. 16 Ch. 9 and 10

SI session Oct. 16 Ch. 9 and 10 - Kaiser Imam BIOL 215 SI...

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Kaiser Imam October 16, 2007 BIOL 215 SI Session Chapters 9 and 10 Chapter 9: Glycolysis and Fermentation 1. What is the difference in Δ G ° between the combustion of a marshmallow over a fire and the biological oxidation of that marshmallow by respiration? 2. What is the difference between aerobic respiration and anaerobic respiration? 3. Distinguish between the following types of organisms. a) Obligate aerobes b) Obligate anaerobes c) Facultative anaerobes 4. What is substrate-level phosphorylation? 5. List the 3 phases of glycolysis and describe key events within each. 1) Gly-1 → Gly-5 ______________________________________ 1
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2) Gly-6 → Gly-7 ______________________________________ 3) Gly-8 → Gly-10 __________________________________________ 6. Write a general reaction equation for the glycolysis process. 7. An extract of yeast contains all of the enzymes required for glycolysis, ADP, P i , NAD + , and glucose, but when these are all combined none of the glucose is consumed. Provided that there are no enzyme inhibitors present, why doesn’t the reaction proceed? 8. Given an unlimited source of glucose, what is the limiting reagent in the glycolytic reaction? 9. How are sugars other than glucose, such as fructose and galactose, metabolized in the cell? 2
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10. What happens to the two pyruvate molecules that are produced by glycolysis? 11. What is the main purpose of fermentation? 12. List 2 differences between respiration and fermentation: 13. Trematol is a metabolic poison derived from the white snake root. Cows eating this plant concentrate the poison in their milk. The poison inhibits liver enzymes that convert lactic acid to other compounds for metabolism. Why does physical exertion increase symptoms of poisoning by trematol? Why does the pH of the blood decrease in a person who has
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