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Ch. 3 Terms

TermDefinition
cell theory the movement of substances across a cell membrane without the use of energy by the cell
diffusion the movement of particles from regions of higher density to regions of lower density
concentration gradient a difference in the concentration of a substance across a distance
osmosis the diffusion of water or another solvent from a more dilute solution to a more concentrated solution through a membrane that is permeable to the solvent
isotonic solution that has an equal concentration of dissolved particles compared with another solution
hypertonic describes a solution whose solute concentration inside a cell
hypotonic describes a solution whose solute concentration inside a cell
facilitated diffusion the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
active transport the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy
endocytosis the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
phagocytosis uptake of a solid particle into a cell by engulfing the particle
exocytosis the process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to let the substance
cytoplasm
organelle
prokaryotic cell
eukaryotic cell
cytoskeleton
nucleus
endoplasm reticulum
ribosome
Golgi apparatus
vesicle
mitochondrion
vacuole
lysosome
centriole
cell wall
chloroplast
cell membrane
phospholipid
fluid mosaic model
selective permeability
receptor
Created by: EliseD
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