| A | B |
|---|
| cell | smallest unit that can perform all the processes necessary for life |
| microscope | an instrument that makes small objects look bigger |
| compound microscope | a light microscope that has more than one lens |
| magnification | the ability to make things look larger than they are |
| convex lens | a lens that is thick in the middle and enlarges things as it bends light waves to a focal point |
| resolution | the ability to focus more clearly on an image |
| electron microscope | uses a beam of electrons instead of light; improves resolution |
| Robert Hooke | first to describe cells; said they looked like little boxes |
| Anton van Leeuwenhoek | first to see bacteria |
| cell theory | an accepted explanation of the relationship between cells and living things |
| cell theory parts | 1) all organisms are made of cells; 2) cells are the basic unit of life; 3) cells come from existing cells |
| cell membrane | a protective layer that controls what enters and leaves the cell |
| cytoplasm | the gel-like fluid that fills the cell |
| organelles | structures in the cell that perform certain functions |
| DNA | the genetic material in cells passed from parent to offspring |
| prokaryotes | single celled organisms that lack a nucleus and membrane bound organelles |
| bacteria | smallest known cells; have no nucleus |
| archaea | like bacteria, but live where no other organisms live |
| kinds of archaea | 1-heat loving; 2-salt loving; 3-methane making |
| eukaryotes | largest cells; have a nucleus; includes plants and animals |
