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ch.5
sec1
15
Biology
9th Grade
02/09/2011

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Term
passive transport
Definition
the movement of substances across a cell membrane without the use of energy by the cell
Term
diffusion
Definition
the movement of particles from regions of high to low density
Term
concentration gradient
Definition
a difference in the concentration of a substance across a distance
Term
equilibrium
Definition
a stste that exists when the concentration of a substance is the same throughout a space
Term
osmosis
Definition
the diffusion of water or anther solvent from a more concentrated
Term
hypotonic
Definition
describes a solution whose solute concentrationis lower then the solute is lower then the solute concentration inside a cell
Term
hypertonic
Definition
describes a solution whose solute concentration inside a cell
Term
isotonic
Definition
describes a solution whose solute concentration is equal
Term
contractile vacuole
Definition
an organelle that accumulates water
Term
turgor pressure
Definition
the pressure that is exerter on the inside of cell walls
Term
plasmolysis
Definition
the contraction or shrinking of the cell membrain of a plant cell
Term
cytolysis
Definition
the bursting of a cell
Term
facilitated diffusion
Definition
the transport of substances though a cell membrane
Term
carrier protein
Definition
a protein that transports substances across a cell membrane
Term
ion channel
Definition
a complex of protein molecules in a cell membrane
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