| A | B |
| binary fission | the simple cell division used by bacteria in which one cell splits into two |
| endospore | a bacterium surrounded by a thick, protective membrane |
| cocci | spherical bacteria |
| bacilli | rod-shaped bacteria |
| spirilla | long, spiral-shaped bacteria |
| strepto | prefix meaning in chains |
| staphylo | prefix meaning in clusters |
| diplo | prefix meaing two |
| saprobe | decomposers; feed on dead organic matter |
| blue-green bacteria | a group of monerans that live in moist environments and use sunlight energy to obtain food (photosynthesis) |
| nitrogen-fixing bacteria | consume nitrogen in the air and change it into a form that plants can use |
| bioremediation | the use of bacteria and other microorganisms to change pollutants into harmless chemicals |
| antibiotic | medicines used to kill bacteria and other microorganisms |
| pathogenic bacteria | bacteria that invade a host organism and obtain the nutrients they need from the host's cells |
| virus | a microscopic particle that invades a cell and often destroys it |
| host | an organism that supports a parasite |
| aerobe | an organism that needs oxygen to live |
| anaerobe | an organism that does not need oxygen to live |
| asexual reproduction | reproduction by just one parent |
| conjugation | a process in which DNA passes between two cells that join together |