9-29-09 - Membrane Structure and Function Reading...

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Unformatted text preview: Membrane Structure and Function Reading Assignment: Chap. 7, 125-141 Lipid Bilayer Membrane Proteins Location in the bilayer Function of membrane proteins Fig. 7-7 Figure 7.7 The detailed structure of an animal cell’s plasma membrane, in a cutaway view Fibers of extracellular matrix (ECM) Glycoprotein Carbohydrate EXTRACELLULAR Glycolipid SIDE OF MEMBRANE Cholesterol Microfilaments of cytoskeleton Peripheral proteins Integral protein CYTOPLASMIC SIDE OF MEMBRANE Figure 7.3 The fluid mosaic model for membranes Phospholipid bilayer Hydrophobic regions of protein Hydrophilic regions of protein Plasma Membrane (cont) Membrane carbohydrates Membrane Permeablility Figure 7.9a-c Some functions of membrane proteins Signaling molecule Enzymes Receptor ATP (a) Transport (b) Enzymatic activity Signal transduction (c) Signal transduction Figure 7.9d-f Some functions of membrane proteins Glycoprotein (d) Cell-cell recognition (e) Intercellular joining (f) Attachment to the cytoskeleton and extracellular matrix (ECM) Transport through the Plasma membrane Diffusion (passive transport) Carrier mediated transport Facilitated diffusion (does not require Facilitated energy, but involves protein carrier) energy, Active Transport (requires energy) Osmosis (passive movement of H O) 2 Passive transport Active transport Figure 7.17 Review: passive and active transport compared ATP Diffusion Facilitated diffusion Transport through the Plasma membrane Diffusion (passive transport) Carrier mediated transport Facilitated diffusion (does not require Facilitated energy, but involves protein carrier) energy, Active Transport (requires energy) Osmosis (passive movement of H O) 2 Figure 7.12 Osmosis Lower concentration of solute (sugar) 2 Higher concentration of sugar Same concentration of sugar Selectively permeable membrane Osmosis Figure 7.13 The water balance of living cells Hypotonic solution 2 Isotonic solution 2 2 Hypertonic solution 2 (a) Animal cell Lysed Normal Shriveled (b) Plant cell Turgid (normal) Flaccid Plasmolyzed ...
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This note was uploaded on 11/06/2009 for the course BIOL 152 taught by Professor Niedenthal during the Fall '09 term at Kansas.

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