September 24 Bio

September 24 Bio - Membranes and Transport Why do...

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Membranes and Transport Why do phospholipids for bilayers in the presence of water? phospholipids are amphipathic molecules Steroids carbon atoms arranged in 4 rings cholesterol, bile salts, some hormones Membrane Proteins Integral membrane proteins embedded in lipid bilayer Transmembrane Proteins integral proteins that extend completely through membrane Peripheral Membrane Proteins at surface of lipid bilayer bound to exposed integral proteins Diffusion Net movement of substance down its concentration gradient from region of greater concentration to region of lower concentration Diffusion is passive transport- does not use direct metabolic energy(no ATP required) Simple Diffusion consider- diffusion of CO2 across the plasma membrane of one of your cells Concentration gradient source of energy Net movement is form interior to exterior What substances readi;y diffuse across a lipid bilayer? Gases
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This note was uploaded on 10/05/2010 for the course F 01:119:101 taught by Professor Dianamartin during the Fall '10 term at Rutgers.

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September 24 Bio - Membranes and Transport Why do...

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