| A | B |
|---|
| diffusion | movement of particles from an area of high concentration to an area of low concentration |
| osmosis | diffusion of water through a semi-permeable membrane |
| passive transport | no energy needed to move materials into or out of the cell |
| concentration gradient | difference in concentration between two side-by-side regions |
| active transport | materials move against the concentration gradient, requiring input of energy |
| cell cycle | process through which cell forms new cells |
| chromosome | found in nucleus; structure that stores genetic information |
| binary fission | simple cell division used by prokaryotic cells in which cell splits into two parts |
| mitosis | division of the nucleus of eukaryotic cells |
| asexual reproduction | production of offspring by a single parent |
| sexual reproduction | reproduction in which two parent cells join together to form new individual |
| meiosis | process in sexually reproducing organisms that forms gametes |
| flagellum | long, whiplike organelle used by cells for movement |
| cilia | tiny hair-like structures used for movement by cells |
| homeostasis | maintenance of stable internal conditions |
| pH | description of substance as an acid or a base |
| acid | substance with pH of less than 7 |
| base | substance with pH of more than 7 |
| toxin | any poisonous substance that can harm a living organism |
