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Bio: Cell Transport

Biology Week 8 Cellular Transport

TermDefinition
facilitated diffusion passive transport of a substance through a membrane with the help of transport proteins
diffusion the movement of molecules from an area of high concentration to an area with a lower concentration
concentration gradient the difference in the concentrations of the molecules on either side of a membrane
equilibrium equal concentration of molecules on both sides of a membrane
passive transport the movement of substances across a plasma membrane that does not require energy because the substance is moving from a higher to lower concentration
transport protein protein in a cell membrane that helps molecules pass through the membrane by either forming a channel for the molecules to pass through, or carrying the molecules through the membrane
active transport movement of substances across a plasma membrane that requires energy because the substance is moving against the concentration gradient, from a lower to higher concentration
ion channels membrane-spanning protein that allows transport of a specific ion through the cell membrane
osmosis the diffusion of water molecules across a semi-permeable membrane from an area of high concentration to an area of lower concentration
solute a substance that is dissolved in a solvent to form a solution
solvent a substance that dissolves a solute to form a solution
solution the mixture of a solute in a solvent
hypertonic the solution with the higher solute concentration when comparing two solutions of unequal solute concentration
hypotonic the solution with the lower solute concentration when comparing two solutions of unequal solute concentration
isotonic solutions of equal solute concentration
selectively permeable the ability to allow only certain molecules or ions to cross the plasma membrane; semipermeable
plasmolysis process in which the cell membrane pulls away from the cell wall as a cell shrivels when placed in a hypertonic solution
protein pump a protein embedded in a cell membrane that helps move substances across the membrane
Created by: user-1868057
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