| A | B |
|---|
| cell | smallest unit that can perform all the processes necessary for life |
| microscope | an instrument that makes small objects look bigger |
| 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 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 |
| eukaryotes | largest cells; have a nucleus; includes plants and animals |
| nucleus | holds the genetic material, directs cell activities |
| mitochondria | energy factory of the cell |
| Golgi body | packages and ships out cell products |
| ribosomes | found in all cells, protein factories |
| unicellular | one cell |
| multicellular | many cells |
| chloroplast | harvests energy from sunlight to power photosynthesis, contains chlorophyll makes a plant cell green |
| lysosomes | breaks down or digests large moleclues, waste products, or old organelles |
