| A | B |
|---|
| flagellum | a whiplike tail on bacteria and some protists that helps them move through a moist environmnet |
| fission | a type of asexual reproduction used by bacteria in which one bacterium divides to form two cells with identical genetic material |
| aerobe | organisms that must have oxygen to survive |
| anaerobe | organisms that can survive without oxygen |
| saprophyte | any organism that uses dead material as a food and energy source |
| nitrogen-fixing bacteria | bacteria that change nitrogen from the air into nitrogen compounds that are useful to plants and animals |
| pathogen | any organism that produces disease |
| antibiotic | a substance produced by a n organism that is used to kill or inhibit another organism |
| vaccine | a solution made from damaged virus or bacteria particles or from killed or weakened viruses or bacteria; can prevent, but not cure, many viral and bacterial diseases |
| toxin | a poison produced by disease-causing organisms (pathogens) |
| endospore | a thick walled structure that some bacteria produce around themselves, especially for protection from heat and drought |
| antibiotic resistance | in bacteria, the evolutionary change that occurs when bacterial strains that are mostly killed by a specific drug mutate into strains that are not affected by that drug |
