| A | B |
| prokaryotic cells | no membrane bound organelles and a single chromosome |
| decomposer | breaks down other living things for energy |
| cocci | sphere shaped bacteria |
| bacilli | rod-shaped bacteria |
| spirilla | spiral-shaped bacteria |
| capsule | gel-like covering around the cell wall |
| flagellum | whip like tail used for movement |
| cyanobacteria | bacteria that are producers |
| aerobes | organisms that can survive without oxygen |
| anaerobes | organisms that can live without oxygen |
| fission | produces 2 cells genetically identical to the parent cell |
| saprophyte | organism that uses dead material as food and energy |
| nitrogen-fixing bacteria | convert nitrogen to a form usable by plants and animals |
| pathogen | organism that produces disease |
| antibiotic | substance that inhibits or kills another organism |
| endospores | thick walled strucure around bacteria for protection |
| pasteurization | heating food to a temperature that kills harmful bacteria |
| antibiotic resistance | bacterial strains mutate into a form not affected by a certain drug |
| tuberculosis | a bacteria that attacks the lungs |
| toxins | poisons produced by bacteria |