Chapter 7 - Cellular Membrane & Transport Notes # 2

Chapter 7 - Cellular Membrane & Transport Notes # 2...

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AP BIOLOGY Membranes Fluid Mosaic Model : Phospholipid bilayer Proteins - integral proteins – penetrate hydrophobic layer of bilayer - peripheral proteins – loosely bound to surface Protein functions - transport – channels or transport - enzymatic activity – embedded enzymes with active site exposed - signal transduction – messenger/ receptor interaction - cell-cell recognition – glycoprotein markers - intercellular joining – gap or tight junctions Glycoproteins – carbohydrate chain bonded to membrane protein Glycolipid – carbohydrate bonded to membrane lipid Passive Transport : Diffusion – move with the concentration gradient Osmosis – diffusion of water Tonicity = ability to gain or lose water
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Unformatted text preview: Isotonic no net movement Hypertonic to cell water moves out of cell Hypotonic to cell water moves into the cell Facilitated diffusion- transport proteins: channels and carriers Active Transport : Energy needed i.e. sodium-potassium pump against a gradient Bulk Transport : Exocytosis vesicles from Golgi move to membrane, fuse and spills Contents to outside Endocytosis intake of macromolecules by vesicle formation at membrane-phagocytosis engulfing particle-pinocytosis gulps extracellular fluid with dissolved particles-receptor-mediated endocytosis cell receptors bind ligands, then form a coated pit becoming the vesicle...
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This note was uploaded on 02/14/2012 for the course BIO 151 taught by Professor Grinblat during the Fall '08 term at Wisconsin.

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