BIOL 1201 CH7 Outline & Vocab

BIOL 1201 CH7 Outline & Vocab - Chapter 7 Membrane...

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%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%% Chapter 7 Vocabulary: Chapter 7.1 Vocabulary: Selective Permeability: A property of biological membranes that allows them to regulate the passage of substances. Amphipathic: Having both a hydrophilic region and a hydrophobic region. Fluid Mosaic Model: The currently accepted model of cell membrane structure, which envisions the membrane as a mosaic of protein molecules drifting laterally in a fluid bilayer of phospholipids. Phospholipid: A lipid made up of glycerol joined to two fatty acids and a phosphate group. The hydrocarbon chains of the fatty acids act as nonpolar, hydrophobic tails, while the rest of the molecule acts as a polar, hydrophilic head. Phospholipids form bilayers that function as biological membranes. Integral Proteins: Typically a transmembrane protein with hydrophobic regions that extend into and often completely span the hydrophobic interior of the membrane and with hydrophilic regions in contact with the aqueous solution on either side of the membrane (or lining the channel in the case of a channel protein). Peripheral Proteins: A protein loosely bound to the surface of a membrane or to part of an integral protein and not embedded in the lipid bilayer. Glycolipids: A lipid with covalently attached carbohydrate(s). Glycoproteins: A protein with one or more carbohydrates covalently attached to it. Chapter 7.2 Vocabulary: Transport Proteins: A transmembrane protein that helps a certain substance or class of closely related substances to cross the membrane. Aquaporins: A channel protein in the plasma membrane of a plant, animal, or microorganism cell that specifically facilitates osmosis, the diffusion of water across the membrane. Chapter 7.3 Vocabulary:
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Diffusion: The spontaneous movement of a substance down its concentration gradient, from a region where it is more concentrated to a region where it is less concentrated. Concentration Gradient: A region along which the density of a chemical substance increases or decreases. Passive Transport: The diffusion of a substance across a biological membrane with no expenditure of energy. Osmosis: The diffusion of water across a selectively permeable membrane. Tonicity: The ability of a solution surrounding a cell to cause that cell to gain or lose water. Isotonic: Referring to a solution that, when surrounding a cell, has no effect on the passage of water into or out of the cell. Hypertonic: Referring to a solution that, when surrounding a cell, will cause the cell to lose water. Hypotonic: Referring to a solution that, when surrounding a cell, will cause the cell to take up water. Osmoregulation:
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This note was uploaded on 08/22/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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BIOL 1201 CH7 Outline & Vocab - Chapter 7 Membrane...

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