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Biology test 2

Plasma membrane outer boundary of the cell, 5-10 nm thick
Cell wall Mostly mechanical/protective role--provides support (strength and rigidity) to cell, and some filtering capacity. Found in plants, fungi, bacteria and archaea
Cell membrane In all cells; semi-permeable barrier that contains the cell cytoplasm, controls movement of substances in and out of cell.
Compartmentalization Membranes form continuous sheets that enclose specific intracellular compartments -- allowing specialized activities to proceed w/o extracellular interference
Scaffolding (for biochemical activities) membranes provide a framework that organizes enzymes for effective interaction-- b/c membranes are compartments themselves, as long as reactants are in solution, positions cant be stabilized and interactions depend on random collisions
Selectively permeable barrier membranes allow regulated exchange of substances between compartments-- gated barrier that promotes movement of select elements into and out of the cell
Transporting solutes membrane proteins facilitate the movement of substances between compartments-- physically transports the substances from low concentration of solute to high concentration of solutes
responding to external signals: membra e
Created by: snphillips1



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