01:119:115 Lecture Notes - Lecture 7: Fluid Mosaic Model, Facilitated Diffusion, Cell Membrane
28 Mar 2016
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Document Summary
Polysaccharides atached to protein (glycoprotein) or lipid (glycolipid) Membrane transport: plasma membrane is selecively permeable (ch. 7. 2: 2 basic types of transport, passive doesn"t use metabolic energy (atp, acive does use metabolic e (atp) Net movement down concentraion gradient no atp required. Results in dynamic equilibrium: difusion, tendency for molecules of a substance to ill available space, all molecules in constant random moion, will eventually be evenly distributed in available space. Small polar uncharged molecules (hydrophilic) including h2o: osmosis, difusion of water across selecively permeable membrane b, water difuses: from lower to high [solute] (special case of difusion) Solvent: a substance capable of dissolving other substances. Direcion of osmosis determine by the diference in total [solute] Ability of a soluion to cause a cell or gain or lose water. With cell wall: simple difusion can be insuicient. Transport through an integral membrane protein that changes shape. Works against concentraion gradient i. e. sodium-potassium pump.
