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level: Facilitated diffusion and active transport

Questions and Answers List

level questions: Facilitated diffusion and active transport

QuestionAnswer
Define facilitated diffusionmovement of particles down a concentration gradient, from a higher to a lower concentration.
Is facilitated diffusion passive or activePassive, but process involves carrier proteins and channel proteins
How do carrier proteins work- first, a large molecule attaches to a carrier protein in the membrane - then, protein changes shape - this releases the molecules on the opposite side of the membrane
Define active transportuses energy to move molecules and ions across plasma membranes against a concentration gradient. Process also includes carrier proteins.
Define endocytosis- a cell surrounds a substance with a section of its plasma membrane - the membrane then pinches off to form a vesicle inside the cell containing the ingested substance
Define phagocytosis- endocytosis for solid substances - cell membrane forms (called pseudopods) which surrounds the substance
Define pinocytosis- endocytosis for liquid substances - cell membrane forms (called pseudopods) which surrounds the substance
Define exocytosis- vesicles containing substances produced by the cell pinch off from the sacs of Golgi apparatus and move towards the plasma membrane - the vesicle fuse with the plasma membrane and release their contents outside the cell