| Term | Definition |
| Bacteria | These are prokaryotes (no nucleus). The genetic material in their cells is not contained in a nucleus |
| Cytoplasm | The region inside the cell membrane that contains a gel-like material |
| Ribosome | Located in the cytoplasm. Chemical factories where proteins are produced |
| Flagellum | A long, whiplike structure that helps a cell to move |
| Respiration | The process of breaking down food to release its energy |
| Binary Fission | A process in which one cell divides to form two identical cells |
| Asexual Reproduction | A reproductive process that involves only one parent and produces offspring that are identical to the parent |
| Sexual Reproduction | A reproductive process that involves two parents who combine their genetic material to produce a new organism that is different from both parents |
| Conjugation | A process in which one bacterium transfers some of its genetic material into another bacterium through a thin, threadlike bridge that joins the two. |
| Endospore | A small, rounded resting cell that forms inside a bacterial cell to protect it from harsh conditions. |
| Pasteurization | When food is heated to a temperature that is high enough to kill most harmful bacteria without changing the taste of the food. |
| Decomposer | Organsims that break down large chemicals in dead organisms into small chemicals |
| Hypothesis | An educated and testable guess or a proposed answer to a scientific question |
| Control | The part of an experiment that is used as a comparison |
| Eukaryote | Organisms whole cells have a nucleus |
| Prokaryote | Organisms whose cells lack a nucleus |