Chapter 7 vocabulary - Chapter 7 vocabula ry active t...

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Chapter 7 vocabulary active transport : The movement of a substance across a cell membrane, with an expenditure of energy, against its concentration or electrochemical gradient; mediated by specific transport proteins. adenosine triphosphate (ATP) : An adenine-containing nucleoside triphosphate that releases free energy when its phosphate bonds are hydrolyzed. This energy is used to drive endergonic reactions in cells. amphipathic : Having both a hydrophilic region and a hydrophobic region. aquaporin : 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. concentration gradient : A region along which the density of a chemical substance increases or decreases. 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. electrochemical gradient : The diffusion gradient of an ion, which is affected by both the concentration difference of the ion across a membrane (a chemical force) and the ion's tendency to move relative to the membrane potential (an electrical force). electrogenic pump : An ion transport protein that generates voltage across a membrane. endocytosis : Cellular uptake of biological molecules and particulate matter via formation of new vesicles from the plasma membrane. exocytosis
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This note was uploaded on 04/28/2010 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas at Austin.

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Chapter 7 vocabulary - Chapter 7 vocabula ry active t...

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