| A | B |
|---|
| virus | noncellular organism made up of genetic material and protein |
| reproduction | process of making more of the same kind. |
| bacteria | single-celled living thing that do not have a nucleus |
| nucleus | cell structure that controls most cells and that is not present in bacteria |
| capsule | is a layer outside the cell wall that protects bacteria |
| flagella | long, whiplike fibers that help some types of cells move |
| microbes | organisms that can be seen only through a microscope |
| host | organisms that contain other organisms inside them. |
| blue-green bacteria | bacteria that make their own food by photosynthesis |
| decomposer | living thing that breaks down organisms inot materials that can be reused by other living things |
| nitrogen-fixing bacteria | bacteria that takes nitrogen from the air and form nitrogen compounds |
| antibiotic | drug used to treat diseases caused by bacteria |
| vaccine | drug that helps the body protect itself from disease. |
| protist | single-celled living thing that is more complex than a bacteria |
| chloroplast | structure in which a plant or protist cell uses light energy and matter to make food |
| euglena | plantlike protist that moves with a flagellum |
| paramecium | anima-like protist that moves with cilia |
| cilia | tiny "hairs" on the outside of some cells that push the cell through water |
| amoeba | animal-like protist that moves by changing its shape. |
