2005_campbl07

2005_campbl07 - Important Point: Fluid Mosaic Model The...

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1 Chapter 7: Membrane Structure and Function Important Point: Lipid Bilayer The “ability of the cell to discriminate in its chemical exchanges with the environment is fundamental to life, and it is the plasma membrane that makes this selectivity possible.” Fluid Mosaic Model History of Fluid Mosaic Model For more on this history, see: http://www1.umn.edu/ships/9-2/membrane.htm Movement of Phospholipids
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2 Membrane Fluidity Cholesterol: Temp. Buffer “Cholesterol reduces membrane fluidity at moderate temperatures by reducing phospholipid movement, but at low temperatures it hinders solidification by disrupting regular packing of phospholipids.” Lateral Movement of Proteins Protein diffusion is not as fast as phospholipid diffusion Not all Proteins Move Proteins attached to cytoskeleton or ECM don’t move Transmembrane Protein Know definition of transmembrane protein Note distinct orientation Membrane Proteins
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3 Membrane Protein Functions Membrane asymmetry allows cells to automatically differ their intracellular environment from that existing extracellularly Membrane Protein Functions Membrane Protein Trafficking Note the
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This note was uploaded on 06/03/2011 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.

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2005_campbl07 - Important Point: Fluid Mosaic Model The...

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