AP Biology Membrane carbohydrates Play a key role in cell cell recognition

Ap biology membrane carbohydrates play a key role in

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AP Biology Membrane carbohydrates Play a key role in cell-cell recognition ability of a cell to distinguish one cell from another important in organ & tissue development basis for rejection of foreign cells by immune system
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AP Biology 2007-2008 Movement across the Cell Membrane
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AP Biology Diffusion 2nd Law of Thermodynamics governs biological systems universe tends towards disorder (entropy) Diffusion movement from HIGH LOW concentration Diffusion movement from HIGH LOW concentration
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AP Biology Simple Diffusion Move from HIGH to LOW concentration “passive transport” no energy needed diffusion osmosis movement of water
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AP Biology Facilitated Diffusion Diffusion through protein channels channels move specific molecules across cell membrane no energy needed open channel = fast transport facilitated = with help HIGH LOW
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AP Biology Active Transport conformational change Cells may need to move molecules against concentration gradient conformational shape change transports solute from one side of membrane to other protein “pump” “costs” energy = ATP ATP LOW HIGH
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AP Biology symport antiport Active transport Many models & mechanisms ATP ATP
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AP Biology How about large molecules? Moving large molecules into & out of cell through vesicles & vacuoles endocytosis phagocytosis = “cellular eating” pinocytosis = “cellular drinking” exocytosis exocytosis
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AP Biology Getting through cell membrane Passive Transport Simple diffusion diffusion of nonpolar, hydrophobic molecules lipids HIGH LOW concentration gradient Facilitated transport diffusion of polar, hydrophilic molecules through a protein channel HIGH LOW concentration gradient Active transport diffusion against concentration gradient LOW HIGH uses a protein pump requires ATP ATP
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AP Biology Transport summary simple diffusion facilitated diffusion Active transport ATP
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AP Biology Endocytosis phagocytosis pinocytosis receptor-mediated endocytosis Involves engulfing of solids. Vacuole fuses with lysosome for digestion Is a non-specific process that involves “drinking in” of fluids . This process is triggered by a molecular signal
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AP Biology 2007-2008 The Special Case of Water Movement of water across the cell membrane
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AP Biology Osmosis is just diffusion of water Water is very important to life, so we talk about water separately Diffusion of water from HIGH concentration of water to LOW concentration of water across a semi-permeable membrane
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  • Fall '16
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  •  Salts,  Membrane

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