| A | B |
|---|
| cell | the basic unit of living things |
| organism | any individual form of life that is capable of growing and reproducing |
| unicellular | organisms made of a single cell |
| multicellular | organisms made up of many cells |
| microscope | an instrument which makes an object appear bigger than it is |
| cell membrane | thin, flexible barrier around a cell; regulates what enters and leaves the cell |
| nucleus | control center of the cell, contains the cell's genetic material |
| electron microscope | instrument that uses a beam of electrons instead of light to magnify structures up to 500,000 times actual size; allows scientists to view structures within a cell |
| light microscope | instrument that uses a beam of light passing through one or more lenses to magnify an object |
| organelle | a tiny cell structure that carries out a specific function within the cell. |
