Chapter 11 Answers - Study Guide Chapter 11 Membranes...

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175 Study Guide Chapter 11: Membranes Answers 11-1 (e) 11-2 Choice (b) is the correct answer. At colder temperatures, the membrane will be less fluid. Hence, in order to maintain the status quo, the bacterium will have to take measures to increase membrane fluidity. Increasing the length of the hydrocarbon tails (choice (a)) would decrease membrane fluidity, while decreasing the number of glycolipids (choice (e)) would have little or no effect. Decreasing the proportion of fatty acid tails with no double bonds (fully saturated) (choice (c)) would decrease membrane fluidity. Bacteria do not have cholesterol (choice (d)). 11-3 (a) Unsaturated fatty acid tails do have fewer hydrogen atoms and do interact less well with one another but not for the reason stated. The decrease in interaction is due to a decrease in van der Waals interactions between the hydrocarbon tails because they can pack less closely. Hydrocarbon chains cannot form hydrogen bonds with each other. 11-4 (d) 11-5 (c) As phospholipids are initially inserted into the cytosolic face of the lipid bilayer, flippases are required to move X and Y to the opposite face, as they cannot spontaneously flip across the bilayer. 11-6 (a) The peptide is extremely hydrophilic and is, therefore, unlikely to be inserted into the lipid bilayer. It is also too short to span the membrane as an α -helix. Although it is possible that the lysines interact with an acidic membrane protein, if such an
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