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AP-Bio-HW-8-091009 (1)

AP-Bio-HW-8-091009 (1) - 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 Objectives   1. Explain why phospholipids are amphipathic molecules. - Amphipathic = hydrophobic end & hydrophilic end - Phospholipids are composed of a phosphate group ‘head’ and hydrocarbon ‘tails’. The phosphate groups is polar and the hydrocarbons nonpolar. Water a polar molecule is attracted to its phosphate ‘head’ and repelled from its hydrocarbon ‘tail’. This differentiates the molecule into a hydrophilic head and hydrophobic tail. A molecule with both hydrophobic and hydrophilic regions is amphipathic. 2. Explain what freeze-fracture techniques reveal about the arrangement of proteins in membranes. - Proteins embedded in membrane o Freeze fracture splits the cell membrane down the middle. When the bilayer splits we can visually examine each layer under the microscope. Each layer appears textured interspersed with distinct bumps and dips. The bumps are each embedded protein molecules. Should the layer be compared to one another the bumps don’t match up. The proteins go wholly to one side of the membrane. The information above, conveniently, supports the fluid mosaic diagram of protein arrangement. 3. Describe the fluidity of the components of a cell membrane and explain how
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-membrane fluidity is influenced by temperature and membrane composition.
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AP-Bio-HW-8-091009 (1) - Homework#8(091009 Chapter 7(due...

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