AP-BioHW8 - Objectives Homework#8(091009 Chapter 7(due...

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Homework #8 (091009): Chapter 7 (due Friday 091009 ) Total points: 20 for Attempt on all questions ONE Concept Map: 10 points Amit Patel period 3 10/20/11 Objectives   1.Explain why phospholipids are amphipathic molecules. Because phospholipids have a hydrophobic tails and hydrophilic heads they are amphipathic as they contain both hydrophilic and hydrophobic regions. - hydrophobic tails - hydrophobic tails - contain both - amphipathic 2. Explain what freeze-fracture techniques reveal about the arrangement of proteins in membranes. Freeze fracture splits membranes at the middle, where cell bonds are weakest, and that reveals the internal arrangement of the membrane proteins and the two surfaces of either side of the membrane. -down middle -weakest bonds -membrane proteins -surfaces 3. Describe the fluidity of the components of a cell membrane and explain how membrane fluidity is influenced by temperature and membrane composition. A cell membrane’s phospholipids move freely laterally but rarely flip due to hydrophobic tendencies. Unsaturated fatty acid tails also help to keep the membranes fluid as temperature sinks until the molecules are forced together into a solid. -phospholipids freely move -rarely flip - unsaturated fatty acid -is an “antifreeze” for membrane 4. Explain how cholesterol resists changes in membrane fluidity with temperature change. Cholesterol resists membrane fluidity changes with temperature swings by restricting the movement of phospholipids at high temperatures and delays freezing by preventing phospholipids from clumping. -anti clumping agent -restricts movement -resists change 5. Distinguish between peripheral and integral membrane proteins. Integral proteins are buried deep within the phospholipid bilayer, in the hydrophobic
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AP-BioHW8 - Objectives Homework#8(091009 Chapter 7(due...

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