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| A property of biological membranes that allows them to regulate the passage of substrates |
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| Having both a hydrophilic region and a hydrophobic region |
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| The currently accepted model of cell membrane as a mosaic of protein moelcules drifting laterally in a fluid bilayer of phospholipids |
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| Typically a transmembrane protein with hydrophobic regions that extend into and often completely span the hydrophobic interior of the membrane with hydrophilic regions in contact with the aqueous solution on either side of the membrane |
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| A protein loosely bound to the surface of a membrane or to part of an intergral protein and not embedded in the lipid bilayer |
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| A lipid with covalently attached carbohydrates |
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| A protein with one or more carbohydrates covalently attached to it |
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| 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 |
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| 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 |
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| A region along which the density of a chemical substance increases or decreases |
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| The diffusion of a substance across a biological membrane with no expediture of energy |
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| The diffusion of water across a selectively permeable membrane |
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| Referring to a solution that when surrounding a cell has no effect on the passage of water into or out of the cell |
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| Referring to a solution that, when surrounding a cell, will cause the cell to lose water |
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| Referring to a solution that, when surrounding a cell, will cause the cell to take up water |
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| Regulation of solute concentrations and water balance by a cell or organism |
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| Limp, lacking in stiffness, or firmness |
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| A phenomenon in walled cells in which the cytoplasm shrivels and the plasma membrane pulls away from the cell wall |
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| The spontaneous passage of molecules or ions across a biological membrane with the assistance of specific transmembrane transport proteins |
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| A transmembrane protein channel that allows a specific ion to flow across the membrane down its concentration gradient |
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| A transmembrane protein channel that opens or does in response to a particular stimulus |
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| A transport protein in the plasma membrane of animal cells that actively transports sodium out of the cell and potassium into the cell |
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| The difference in electrical charge (voltage) across a cell's plasma membrane due to the differential distribution of ions |
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| The diffusion gradient of an ion, which is affected by both the concentration difference of the ion across the membrane and the ions tendency to move relative to the membrane potential |
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| An ion transport protein that generates voltage across a membrane |
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| An active transport protein in a cell membrane that uses ATP to transport hydrogen ions out of a cell against their concentration gradient, generating a memrane potential in the process |
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| The coupling of the "downhill" diffusion of a substance to the "uphill" transport of another against its own concentration gradient |
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| The cellular secretion of biological molecules by the fusion of vesicles cantaining them with the plasma membrane |
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| A type of endocytosis in which large particulate substances are taken up by the cell |
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| A type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes |
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| Receptor Mediated Endocytosis |
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Definition
| The movement of specific molecules into a cell by the inward budding of membranous vesicles containing proteins with receptor sites specific to the molecules being taken in |
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| A molecule that binds specifically to another molecule usually a larger one |
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