| A | B |
| Flagellem | A whip-like tail found on protistsand bacteria that assists them in moving |
| Fission | A kind of asexual reproduction (involving bacteria) in which one bacterium separates into two cells that have the same genetic makeup |
| Aerobe | An organism that requires oxygen for survival |
| Anaerobe | An organism that does not require oxygen for survival |
| Saprophyte | An organism that uses dead material as a resource for energy and food |
| Nitrogen-fixing bacteria | Bacteria that change nitrogen in the air into compounds of nitrogen, which are helpful to animals and plants |
| Pathogen | An organism that generates disease |
| Antibiotic | A stubstance produced to destroy or slow down the growth of bacteria |
| Vaccine | A substance that causes the body to resist infection or develop immunity to a specific virus |
| Toxin | A poison that is produced by pathogens |
| Endospore | A bacterial cell that possesses a thick-walled structure around it |
| Antibiotic resistant | Evoulutionary change that occurs in bacteria, when strains of bacteria become unaffected by a specific drug that once worked to kill them |
| Protist | Eukaryotic simple multi-cellular or single-celled organisms that live in wet environments |
| Algae | Protists that contain chlorophyll, and through the process of photosynthesis, are able to make food |
| Protozoa | Animal-like protists that are single-celled, animal like protists |
| Pseudopod | A cytoplasmic extension, which resembles a foot, that is used to capture food |
| Cilia | Short, hair-like structures that stretch from the cell membrane to help timy organisms move |
| Hyphae | The large amount of multi-celled tubes thta produce a fungus's body |
| Spore | Reproductive cells that form without fertilization in some plants and protists |
| Sporangia | The circular spore case in zygote fungi |
| Ascus | A tiny, saclike structure in which spores are created in sac fungi |
| Budding | A kind of asexual reproduction where a new organism grow out of its parent's side |
| Basidium | A club shaped structure in which spores are created in club fungi |
| Lichen | The combination of green algae or cyanobacterium and a fungus that form a mutualistic relationship |
| Red tide | An algae population explosion that causes salt water to appear red and results in the illness and death of many fish |