9.16.05 - September 16, 2005 Note: Osmosis questions WILL...

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September 16, 2005 Note: Osmosis questions WILL BE ON EXAM!!!! Diffusion is the driving force of cell permeability Rate of Solute movement = d C AP A=area, P=permeability, d=distance, delta C= Change in concentrations Permeability: Low permeability: Ions, large, uncharged, polar molecules, High Permeability: Hydrophobic molecules Note: Lipid bilayers with unsaturated FAs are more permeable than saturated FAs because the more kinks, the easier to get through. red=high permeability, blue =low Selective Permeability: Some transport proteins will only let certain moleculed get through Example: Sodium Potassium Pump o Increased permeability to potassium Example: Gramacidin Peptide (an antibiotic) Transport Proteins affect diffusion Diff. in conc. of solute Rate of diffusion through embrane w/ pores. Announcements: Pizza Dinner/Movie SUNDAY @6, RPCC Aud. “Welcome to MarS” Monday: Mars 1 st 3 web quizzes due 9/22
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Water - Flows across most cell membranes
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This note was uploaded on 02/11/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell.

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9.16.05 - September 16, 2005 Note: Osmosis questions WILL...

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