| A | B |
|---|
| cell | the basic unit of life |
| cell theory | fundamental concept of biology |
| nucleus | a structure that contains the cell's genetic material in the form of DNA |
| eukaryote | an organism whose cells contain a nucleus |
| prokaryote | a unicellular organism that lacks a nucleus |
| organelle | a specialized structure that performs important cullular functions within a eukaryotic cell |
| cell membrane | thin, flexible barrier that surrounds all cells; regulates what enters and leaves the cell |
| cell wall | strong, supporting layer around the cell membrane in some cells |
| lipid bilayer | flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings |
| diffusion | process by which particles tend to move from an area where they are more concentrated to an area where tehy are less concentrated |
| osmosis | the diffusion of water through a selectively permeable membrane |
| isotonic | when the concentration of two solutions is the same |
