cell 1 - Problem Set #1 Cell Biology Summer Session II 2009...

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Problem Set #1 Cell Biology Summer Session II 2009 1. Infection by Vibrio cholerae , a pathogenic intestinal bacterium, causes a reduction in the activity of the Na+/K+ ATPase in intestinal epithelial cells. This results in reduced uptake of small sugars and amino acids from the intestine. What is the molecular mechanism by which impaired Na+/K+ ATPase function affects sugar and amino acid uptake? 2. Predict which one of the following organisms will have the highest percentage of unsaturated fatty acid chains in their membranes. Explain your answer. A. Antarctic fish B. Desert iguana C. Human being D. Polar Bear E. Thermophilic bacterium 3. The lipid bilayers in cells are fluid, yet asymmetrical. Is this a paradox? Explain your answer. 4. You have prepared liposomes that contain Na+/K+ pumps as the sole membrane protein. Assume for the sake of simplicity that each pump transports one Na+ one way and one K+ the other way in each pumping cycle, as illustrated in the figure above. All
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cell 1 - Problem Set #1 Cell Biology Summer Session II 2009...

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