| A | B |
|---|
| flagella | whiplike tails that help the bacteria move in moist or wet environments |
| fission | the most simple type of asexual reproduction in which two new cells are produced from one parent cell |
| aerobe | an organism that uses oxygen for respiration |
| anaerobe | an organism that is adapted to live without oxygen |
| antibiotic | chemicals that are produced by bacteria that are used to limit the growth of other bacteria |
| saprophyte | any organism that uses dead organisms as a food source |
| nitrogen-fixing bacteria | these organisms change nitrogen from the air into forms that plants and animals can use |
| pathogen | any organism that causes disease |
| toxin | poisonous substances produced by pathogens |
| endospore | thick-walled protective structure produced by some bacteria when conditions are unfavorable |
| vaccine | preparation made from killed bacteria or damaged particles from bacterial cell walls or viruses that can prevent some bacterial and viral diseases |
