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SI session Oct. 11 Ch. 8 and 9

SI session Oct. 11 Ch. 8 and 9 - Kaiser Imam BIOL 215 SI...

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Kaiser Imam October 11, 2007 BIOL 215 SI Session Chapters 8 and 9 Chapter 8: Transport Processes 1. List 3 reasons why cells utilize active transport: 1) 2) 3) 2. What is the difference between direct and indirect active transport? 3. Describe the following types of ATPases involved in active transport: a) P-Type ATPases: b) F-Type ATPases: c) ABC-type ATPases: 4. Explain the mechanism of the Na + /K + pump. 1
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5. Explain the mechanism of the Na + /Glucose symporter. 6. Diagram how the transporters described above are used to absorb glucose from the small intestine into the blood. 7. Oubain is a very specific inhibitor of the active transport of sodium ions out of the cell and is therefore a valuable tool in studies of membrane transport mechanisms. Which of the following processes would you expect to be sensitive to inhibition by oubain? a) Facilitated diffusion of glucose into a muscle cell b) Active transport of dietary phenylalanine across the intestinal mucosa c) Uptake of potassium ions by red blood cells d) Active uptake of lactose by the bacteria in your intestine 2
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8. List whether the following questions involve simple diffusion ( S ), facilitated diffusion ( F ), or active transport ( A ). More than one answer may apply. a) Involves ATPases ____________ b) Applies to small, nonpolar molecules ____________ c) Transport of ions ____________ d) Uses integral membrane proteins ____________ e) Used to transport glucose ____________ f) Used to transport carbon dioxide ____________ g) Used to transport water ____________ h) Used to transport sodium ions ____________ 9. How is the activity of membrane transport proteins similar to the function of enzymes? 10. A particular red blood cell has an internal fructose concentration of 0.5 mM and an external concentration of 30 mM. What is the free energy change of the transport of fructose into the cell at 25 °C?
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