| A | B |
|---|
| Aerobe | any organism that uses oxygen for respiration |
| Anaerobe | any organism that is able to live without oxygen |
| Antibiotic | chemicals produced by some bacteria that are used to limit the growth of other bacteria |
| Endospore | thick-walled, protective structure produced by some bacteria when conditions are unfavorable for survival |
| Fission | simplest form of asexual reproduction in which two new cells are produced with genetic material identical to each other and identical to the previous cell |
| Flagella | whip like tails that help bacteria move |
| Nitrogen-fixing bacteria | bacteria that convert nitrogen in the air into forms that can be used by plants and animals |
| Saprophyte | organism that uses dead organisms as a food source and helps recycle nutrients so they are available for use by other organisms |
| Toxin | poisonous substance produced by some pathogens |
| Vaccine | preparation made from killed bacteria or damaged particles from bacterial cell walls or viruses that can prevent some bacterial and viral diseases |
