bio1.26 - Shared structural features: Plasma Membrane:...

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Shared structural features: •Plasma Membrane: •Boundary that separates living cell ffrom itts surroundings •Exibits selective permeability –Allows some substances to cross I more easily than others FLUID MOSAIC MODEL: •Membrane is fluid -Phosphoplipid bilayer •Membrane is a mosais of proteins -Transport proteins (move stuff across phospholipids memberane) -Receptor proteins (cell comm.) -Recognition proteins (recognize other things) -Determine funtion membranes Transport Across Membranes •A cell must exchange materials with its surroundings *oxegyn, sugar, energy, CO2 waste) Controlled by the selective permeability of the plasma membrane •Meajor modes of transport -Passive Transport(Through te membrane -Active Transport (Through the membrane) -Bulk transport Passive Transport •Diffustion: Movement of a substance down its concentration gradient -From region of high concentration to region of low concentration -Requires no energy •Osmosis: Diffusion of water across a membrane Simple diffusion: When the phosphates move across a phospolipid bilayer all by
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bio1.26 - Shared structural features: Plasma Membrane:...

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