BIOL 112 Lecture Notes - Lecture 5: Plasmolysis, Phosphofructokinase, Pinocytosis
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BIOL 112 Full Course Notes
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Water leaves plant cell- plasmolysis water enter plant cell - turgid. Bulk flow = collective movement of substances in same direction in response to force/pressure-blood. 1- passive transport - [high low] no atp. Net diffusion- even if some few particles still move against gradient in random molecule movement. From hypotonic to hypertonic - through semi-permeable membrane. Diffusion of different solutes across selectively permeable membrane. Movement of water out cell -> cell collapse/shrunk - cell death. F- countercurrent exchange diffusion by bulk flow in opposite directions- ex: blood & water-fish gills. 2- active transport - [low high] need atp. Movement of transports against concentration gradients - require energy. A- endocytosis & exocytosis: phagocytosis - endocytosis. Uses atp - secretory vesicle or vesicle formed. Eat- solid undissolved material enters cell - plasma membrane wraps. Outward around & lysosome - ex: white blood cell engulfs. Drink- liquid dissolved material - plasma membrane invaginates. Specific molecules -ligand- bind to receptors *used by ldl proteins.