Chapter7

Chapter7 - What are amphipathic molecules? What are...

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What are amphipathic molecules? What are aquaporins? What is diffusion? How is membrane fluidity influenced by temperature and membrane composition? What are the differences between peripheral and integral membrane proteins? What are the differences between channel and carrier proteins? What are the differences between osmosis, facilitated diffusion, and active transport? What are the differences between hypertonic, hypotonic, and isotonic solutions? Molecules containing hydrophobic and hydrophilic regions. I.e. phospholipids (the most abundant lipid in the plasma membrane). A type of channel protein that facilitate the passage of water through the passage of the membrane. The tendency for molecules to spread out evenly into the available space; a type of passive transport. As temperature decreases, membrane fluidity goes from fluid to solid. Membranes must be fluid to work properly. Membranes made of unsaturated fats are more fluid than those made with saturated fats. At high temperatures, cholesterol restrains movement of phospholipids, at lower temperatures cholesterol retains the plasma membranes fluidity by preventing tight packing. Peripheral are bound to the surface of the membrane. Integral penetrate the hydrophobic core (usually consist of nonpolar amino acids, often coiled into alpha helices). Integral proteins that span the membrane are called transmembrane proteins. Both a type of transport protein. Channel proteins have a hydrophilic channel that certain molecules of ions can use as a tunnel. Carrier proteins bind to molecules and change shape to shuttle them across the membrane. Osmosis: diffusion of water across a selectively
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This note was uploaded on 11/07/2011 for the course BIO bsc2010 taught by Professor Trombley during the Spring '08 term at FSU.

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Chapter7 - What are amphipathic molecules? What are...

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