Lab 2 Ch. 3

Lab 2 Ch. 3 - Ch 3. Membranes and membrane transport...

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Ch 3. Membranes and membrane transport
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Introduction Eukaryotic cellular membranes are fluid mosaics of lipids and proteins Most abundant lipids, Phopholipid is an amphipathic molecule. Fluid mosaic model : protein through the phosphoipid bilayer Membrane structure results in selective permeability Transport: Passive : diffusion Active Bulk Phospholipid bilayer Hydrophilic region of protein Hydrophobic region of protein
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Primary functions of the cell membrane Form the boundary of a cell Provide a reaction and attachment surface Transport of substances in and out of the cell Hold equipment that senses extra cellular parameters (ex. changes in lipid composition) Permit cell-to-cell signaling (Membrane proteins of adjacent cells, intercellular signaling).
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Receptor proteins binds to a specific molecule (a ligand) and initiates the membrane response to the ligand Cholesterol : prevents crystallization of hydrocarbons and phase shifts in membrane Transport protein are transmembrane proteins, with fixed topology. Glycoprotein
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This note was uploaded on 02/09/2009 for the course BISC 220LG taught by Professor Mcclure during the Spring '07 term at USC.

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Lab 2 Ch. 3 - Ch 3. Membranes and membrane transport...

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