| A | B |
|---|
| Flagella | Whiplike tails that help many types of bacteria move around in moist environments. |
| Fission | Simplest form of asexual reproduction in which two cells are produced with genetic material identical to that of the parent cell. |
| Aerobe | Organisms that require oxygen to survive. |
| Anaerobe | Organisms that are able to live without oxygen. |
| Saprophyte | Any organism that uses dead material as a food and energy source. These organisms decompose dead organisms and recycle nutrients so that they are available for use by other organisms. |
| Nitrogen-fixing Bacteria | Bacteria that live in the root nodules of certain kins of plants and change nitrogen from the air into forms useful for animals and plants. |
| Pathogen | Any organism that produces disease. |
| Antibiotic | Substance produced by one organism that inhibits or kills another organism. |
| Vaccine | Preparation made from damaged virus particles that are no longer able to cause disease and that can prevent some viral disease such as polio and measles. |
| Toxin | Poison produced by a bacterial pathogen. |
| Endospore | Heat-resistant, thick-walled structures many bacteria can produce around themselves when conditions are unfavorable. |
