Ch_4_SG_020608 - BIO 105 Ch 4 Membrane structure function...

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BIO 105 Ch. 4 Membrane structure & function Wed., Feb. 6, 2008 4.1 Plasma membrane structure and function Membrane structure Fluid-mosaic model Phospholipid bilayer Hydrophobic tails face inward Hydrophilic heads face surfaces Proteins Integral proteins-embedded Peripheral proteins-inner surface Glycoproteins, glycolipids, cholesterol Fluid-mosaic model of membrane structure Functions of membrane proteins Channel proteins Form channels for substances can move across membrane Receptor proteins Bind to substances in the environment and trigger cell responses Carrier proteins Transport specific substances across cell membrane Enzymes Catalyze chemical reactions for cell metabolism Membrane protein diversity Carbohydrate chains Bound to outer surface of cell recognition proteins Form a “sugar coat”-glycocalyx Diversity of carbohydrate chains produces individual “fingerprint” Recognition of self vs. nonself
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