| A | B |
|---|
| Leeuwenhoek | observed living cells |
| cell wall | protect and support cell |
| nucleus | control center of cell |
| element | cannot be broken down |
| enzyme | speed up chemical reaction |
| starches | sugar molecules strung together to form large molecules |
| osmosis | diffusion of water through selectively permeable membrane |
| electron microscope | light reflected by electron beam |
| active transport | movement of materials requiring energy |
| passive transport | movement of materials not requiring energy |
| diffusion | movement of molecules from an area of high concentration to an area of low concentration |
| mitochondria | convert energy from food to energy for cell |
| cell membrane | control which substances enter and leave cell; found in all cells |
| resolution | how well structures close together can be distinguished |
| microscope | made it possible to see cells |
| vacuole | stores food and other materials needed by the cell |
| lysosome | releases chemicals that break down food |
