Biology > QUESTIONS & ANSWERS > The Lipid Bilayer CHAPTER 11 MEMBRANE STRUCTURE University of North Texas - PHYS PHYS 1410Ch11 (All)

The Lipid Bilayer CHAPTER 11 MEMBRANE STRUCTURE University of North Texas - PHYS PHYS 1410Ch11

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CHAPTER 11 MEMBRANE STRUCTURE  2009 Garland Science Publishing The Lipid Bilayer 11-1 Indicate whether the following statements are true or false. If a statement is false, explain why it is fa... lse. A. Although cholesterol is a hydrophobic molecule, it has a hydrophilic head group like all other membrane lipids. FALSE cholesterol is amphipathic, it fits in between the phospholipids and blocks diffusion through the membrane by increasing hydrophobic interactions. B. Phosphatidylserine is the most abundant type of phospholipid found in cell membranes. C. Glycolipids lack the glycerol component found in phospholipids. D. The highly ordered structure of the lipid bilayer makes its generation and maintenance energetically unfavorable. 11-2 Which of the following membrane lipids does not contain a fatty acid tail? (a) Phosphatidylcholine (b) A glycolipid (c) Phosphatidylserine (d) Cholesterol 11-3 Formation of a lipid bilayer might seem to be energetically unfavorable. However, this arrangement is actually favored because it allows a higher level of entropy than any other alternative. What makes bilayer formation energetically favorable? (a) Polar head groups form a hydrogen bonding network at the interface with water. (b) Water molecules form cage-like structures around hydrophobic molecules. (c) Hydrogen bonds form between neighboring polar head groups in the bilayer. (d) Fatty acid tails are highly saturated and flexible. 11-4 Which of the following statements is true? (a) Phospholipids will spontaneously form liposomes in nonpolar solvents. (b) In eucaryotes, all membrane-enclosed organelles are surrounded by one lipid bilayer. (c) Membrane lipids diffuse within the plane of the membrane. (d) Membrane lipids frequently flip-flop between one monolayer and the other. 11-5 A bacterium is suddenly expelled from a warm human intestine into the cold world outside. Which of the following adjustments might the bacterium make to maintain the same level of membrane fluidity? [Show More]

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