Bio - Lecture 6 NOT ON EXAM

Bio Lecture 6 NOT - Organization of Cell Membranes All cells are surrounded by a plasma membrane made mainly of phospholipids Phospholipids are

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Sheet1 Page 1 Organization of Cell Membranes All cells are surrounded by a plasma membrane made mainly of phospholipids Phospholipids are composed of three components: -Glycerol: 3-C alcohol -Fatty acids: Long hydrocarbon chains with a -COOH group -Phosphate group: a functional group that usually has a charged organic molecule linked to it Phospholipids: -Have a polar "head" with a non polar "tail" -Hydrophobic "tails" will interact with eachother in the membrane -Free to move about in the membrane Bilayer: In aqueous solutions, phospholipds orient so the polar head faces the water while the nonpolar tails are inside This results in a phospholipid bilayer which is semi-permeable Lipid bilayers are not static since there are only weak interactions between the nonpolar tails Fluid mosaic model states membrane proteins are inserted rather than covering the membrane Overview: -Adhesion proteins function to allow the cell the adhere to other cells or extracellular srfaces -Communication proteins allow the cell to relay messages
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This note was uploaded on 05/06/2008 for the course BIOL 121 taught by Professor Lopez during the Fall '07 term at Lansing.

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