Human Biology - Cell Surface Membrane and Transport Across Cell Membranes

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A-Level Human Biology Unit 1 Fichas sobre Human Biology - Cell Surface Membrane and Transport Across Cell Membranes, creado por mcrfan354 el 11/04/2015.
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Fichas por mcrfan354, actualizado hace más de 1 año
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Resumen del Recurso

Pregunta Respuesta
BIMOLECULAR (BILAYER) Phospholipid molecules stretched out to form 2 layers
FLUID MOSAIC MODEL Components free to move fluidly, and proteins in the bilayer vary in shape, size and pattern and are arranged like a mosaic.
PASSIVE TRANSPORT Does not involve the use of metabolic transport
DIFFUSION Movement of molecules from a region of high concentration to a region of low concentration, until they are equally distributed (along a concentration gradient)
ACTIVE TRANSPORT Energy-requiring process in which molecules are moved across membranes against a concentration gradient
SOLUTE Any substance that is dissolved in a solvent. SOlutes and solvents form a solution
OSMOSIS The passage of water from a region of high water potential to a region of low water potential through a partially permeable membrane
WATER POTENTIAL The tendency of water molecules to leave a system Ψ = Ψs + Ψp Water potential = solute potential + pressure potential
TURGID The cell vacuole is full of water and the cytoplasm is pushed against the cell wall
HAEMOLYSIS If red blood cells are placed in distilled (pure) water, water enters by osmosis and they burst
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