mcb450-9f09

mcb450-9f09 - Chapter 9 Membranes and Membrane Transport...

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Chapter 9 Membranes and Membrane Transport
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Fig. 9-CO, p. 242 Frog Eggs
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Fig. 9-1, p. 243 A plasma membrane Side-by-side membranes Golgi Pancreatic acinar cell Membranes in Action
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Membrane Phospholipid bilayer plus protein Composition of inside and outside layers different Some proteins are peripheral. Others are integral. Proteins and lipids diffuse laterally within a layer, with very little flip-flop of lipids.
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Fig. 9-2, p. 243 Membrane Composition
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Phospholipids Phospholipids may organize to form different structures as shown on the next slide. At the air-water interface, phospholipids form a monolayer, with their polar heads buried in the water. When a glass microscope slide is dipped into a phospholipid monolayer at the water interface, a bilayer is formed on the slide.
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Fig. 9-3ab, p. 244
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Fig. 9-3cd, p. 244
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Fig. 9-3e, p. 244
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Fig. 9-4, p. 245 Some Detergents
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Shampoos are anionic (negatively-charged) detergents, typically containing sulfate groups. They form micelles, removing grease. When one rinses one’s hair, some shampoo remains. Conditioners cationic detergents. They form complexes with the residual shampoo, forming a grease. The greasy coating makes hair easier to comb. Moral:
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mcb450-9f09 - Chapter 9 Membranes and Membrane Transport...

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