Membrane transport: Difference between revisions
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Membrane transport occurs through the use of membrane transport proteins. Without these, membranes would only be permeable to some gases and small, water soluble molecules. <ref>Lodish H et al. (2012) Molecular Cell Biology, 6th Edition, New York: WH Freeman. pg.473</ref> | Membrane transport occurs through the use of membrane transport [[proteins|proteins]]. Without these, membranes would only be permeable to some gases and small, [[water|water]] soluble molecules. <ref>Lodish H et al. (2012) Molecular Cell Biology, 6th Edition, New York: WH Freeman. pg.473</ref>[[ATP-powered pumps|ATP-powered pumps]] use energy from [[ATP|ATP]] [[hydrolysis|hydrolysis]] in order to move [[ions|ions]] or [[molecules|molecules]] against their concentration gradient, whereas Ion channels allow movement of ions through the membrane down their concentration gradient. Transporters are split into three groups; [[Uniporters|Uniporters]], which transport a single molecule down a concentration gradient, [[Symporters|Symporters]], which transport a molecule against its concentration gradient through the transport of other molecules down their electrochemical gradient (same direction of travel across membrane), and [[Antiporters|Antiporters]], which also use the transport of other molecules down their electrochemical gradient to transport other molecules (opposite directions of travel of molecules across the membrane).<ref>Lodish H et al. (2012) Molecular Cell Biology, 6th Edition, New York: WH Freeman. pg.475</ref> | ||
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Revision as of 17:23, 30 November 2012
Membrane transport occurs through the use of membrane transport proteins. Without these, membranes would only be permeable to some gases and small, water soluble molecules. [1]ATP-powered pumps use energy from ATP hydrolysis in order to move ions or molecules against their concentration gradient, whereas Ion channels allow movement of ions through the membrane down their concentration gradient. Transporters are split into three groups; Uniporters, which transport a single molecule down a concentration gradient, Symporters, which transport a molecule against its concentration gradient through the transport of other molecules down their electrochemical gradient (same direction of travel across membrane), and Antiporters, which also use the transport of other molecules down their electrochemical gradient to transport other molecules (opposite directions of travel of molecules across the membrane).[2]