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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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