| A | B |
|---|
| Bacteria | Single-cell organism |
| Prokaryotes | The genetic material in their cells is not contained in the nucleus. |
| Flagellum | A long, whiplike structure that helps a cell to move. |
| Binary Fission | One cell divides to form two identical cells. |
| Asexual Reproduction | a reproductive process that involves only one parent and produces offspring that are identical to the parent. |
| Sexual Reproduction | Teo parents combine their genetic material to produce a new organism, which differs from both parents. |
| Conjugation | One bacterium transfers some genetic material to another bacterium through a threadlike bridge. |
| Endospore | A small rounded thick-walled, resting cell that forms inside a bacterial cell. |
| Virus | A tiny, nonliving particle that invades and then multiplies inside a living cell. |
| Host | A living thing that provides a source of energy for a virus or an organism. |
| Parasites | Organisms that live on or in a host and cause it harm. |
| Vaccine | A substance introduced into the body to stimulate the production of chemicals that destroy specific disease-causing viruses. |
