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Cell Membrane structure and function Flashcards

Cell organelles, their function; cell membrane structure and functions

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616901372Phospholipidmolecule that has both a hydrophillic region and hydrophobic region1
616901373Phospholipid bilayera double layer of phospholipids that makes up a plasma membrane2
616901374Integral ProteinsProteins that extend through the phospholipid bilayer.3
616901375Peripheral ProteinsA protein loosely attached to the surface of a membrane4
616901376Selective PermeabilityAllows some substances to cross more easily than others5
616901377Diffusionthe movement of molecules from an area of higher concentration to an area of lower concentration, so that they spread out evenly reaching equilibrium6
616901378OsmosisThe diffusion of water across a selectively permeable membrane7
616901379Concentration Gradienta difference in the concentration of a substance across a space8
616901380Transport Proteinsproteins that help to transport substances across cell membranes9
616901381Passive Transportmovement of materials through a cell membrane without using energy10
616901382Isotonica solution whose solute concentration equals that inside a cell; the cell will not change11
616901383Hypertonicthe solution with the greater concentration of solutes than that inside the cell; the cell will lose water to its environment--> Cell will shrivel up12
616901384Hypotonicthe solution with the lower concentration of solutes than that inside the cell; water will enter the cell -> Cell will swell and burst13
616901385Facilitated Diffusionpassive transport of ions or polar molecules across a plasma membrane by transport proteins14
616901386Active Transporttransport of a substance through a cell membrane against the concentration gradient; requires energy15
616901387Sodium-Potassium Pumpa carrier protein that uses ATP to transport sodium ions out of a cell and potassium ions into the cell against the concentration gradient; active transport, requires energy16
616901388Exocytosisprocess by which a cell releases large amounts of material by vesicles17
616901389Endocytosisthe movement of a substance into a cell by a vesicle18
616901390Prokaryotic cellcell lacking a nucleus and most other organelles; found only in bacteria19
616901391Eukaryotic cellcell with a nucleus (surrounded by its own membrane) and other membrane-bound organelles20

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