Chapter 6 Notes

Jul 8th, 2016
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Lecture Notes generated from the following book: Biology, the Dynamic Science. Russell, Wolfe, Hertz and Starr. 2008. ISBN 978-0-534-24966-3

Word Count: 1310
Showing Page: 1/49
Membranes and TransportChapter 66.1 Membrane Structure Biological membranes contain both lipid andprotein molecules Fluid mosaic model explains membrane structure Fluid mosaic model is fully supported byexperimental evidenceVideoBiological Membranes Membrane phospholipids, membrane proteins Both have hydrophobic and hydrophilic regions Dual solubility propertiesPhospholipid Bilayer Membranes are based on fluid phospholipidbilayer Polar regions of phospholipids lie at surfaces ofbilayer Nonpolar tails associate together in interior Serves as a barrier that prevents passage ofmost water-soluble moleculesPhospholipid BilayerFig. 6-2, p. 120Cholesterol in Bilayers= Helps to maintain fluidityCholesterolHydrophilicendHydrophobicendHydrophobictailFig. 6-3, p. 121Fluid Mosaic Model of CellMembranes Cell membrane components are a mix ofdifferent components (mosaic) Phospholipids Proteins Cholesterol Glycolipids Phospholipids give movement Spin or twirl Move sideways Flex their tailsOutside cellIntegralproteinsCarbohydrategroupsIntegralproteinsGlycolipidIntegral protein(transport protein)GateCholesterolGlycoproteinIntegral protein Peripheral(gated channel proteinsCytosolprotein)PlasmamembraneMicrofilamentPeripheralof cytoskeleton proteinPeripheral protein(linking microtubuleto membrane)Fig. 6-5, p. 122Selective Permeability So

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