| A | B |
|---|
| Cell | collection of living mater enclosed by a barrier that separates the cell from its surroundings; basic unit of all forms of life |
| Cell theory | idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells |
| Cell membrane | thin, flexible barrier around a cell; regulates what enters and leaves the cell |
| Nucleus | the center of the atom which contains the protons and neutrons in cells; large structure inside some cells that contain the cell's genetic material and controls the cell's activities |
| Cytoplasm | material inside the cell membrane--- but not including the nucleus |
| Prokaryote | single-celled microorganism that lacks a nucleus |
| Eukaryote | organism whose cells contain nuclei |
| Organelle | specialized structure that that performs important cellular functions within a eukaryote cell |
