Lecture Notes 10-03-08 - form favorable interactions with...

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The Cell Membrane Cell membranes consist of a continuous  double layer of lipid molecules in which  membrane proteins are embedded The lipid layer is fluid, with individual lipid  molecules able to diffuse rapidly within  their own monolayer, but not between  monlayers The fluidity of the lipid bilayer depends on  its composition
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The most abundant membrane lipids are the  phospholipds Differences in length and saturation of the  fatty acid tails influence membrane fluidity Lipid molecules spontaneously aggregate to  expose their hydrophilic heads to water and  hide their hydrophobic tails from water
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Acetone is polar and dissolves in water 2-methyl propane is hydrophobic and cannot 
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Unformatted text preview: form favorable interactions with water Phopholipids are free to diffuse laterally The double bond in the hydrocarbon makes it more difficult to pack the chains together, thereby making the lipid bilayer more fluid. Because free edges with water are energetically unfavorable, the phospholipid bilayer will form a sealed compartment Lipid Molecules The lipid bilayer is not composed solely of phospholipids There are three classes of membrane lipid molecules: Cholesterol Phospholipids Glycolipids The lipid composition of the inner and outer monolayers is different, reflecting different functions for these layers...
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This note was uploaded on 02/22/2010 for the course BE 2400 taught by Professor Goldman during the Fall '08 term at Michigan Technological University.

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Lecture Notes 10-03-08 - form favorable interactions with...

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