| A | B |
|---|
| Bacterium | microscopic prokaryote. |
| Conjugation | process in which two bacteria of the same species attach to each other and share genetic material. |
| Endospore | form of bacterium that has a thick internal wall around its chromosome and part of the cytoplasm. |
| Fission | cell division that forms two genetically identical cells. |
| Flagellum | long whiplike structure that helps some bacteria move. |
| Antibiotic | medicine that stops the growth and reproduction of bacteria. |
| Bioremediation | use of organisms to clean up environmental pollution. |
| Decomposition | breakdown of dead organisms and organic waste. |
| Nitrogen fixation | conversion of atmospheric nitrogen into nitrogen compounds that living things can use. |
| Pasteurization | process of heating food to a temperature that kills most harmful bacteria. |
| Pathogen | agent that causes disease. |
| Resistance | capacity of an organism to defend itself against disease. |
| Antibody | protein that can attach to a pathogen and make it useless. |
| Immunity | ability of an organism to resist a virus or infection. |
| Mutation | change in DNA or RNA. |
| Vaccine | mixture containing material from one or more deactivated pathogens. |
| Virus | strand of DNA or RNA surrounded by a protein layer that can infect and replicate in a host cell. |
