| A | B |
|---|
| Robert Hooke | examined thin cork slices with a compound light microscope and saw boxlike structures that he called cells |
| Anton van Leeuwenhoek | first to describe single celled organisms. However, he did not realize that he was seeing single celled organisms |
| Matthias Schleiden | stated all plants are made of cells |
| Theodor Schawann | stated that all animals are made of cells |
| Rudolf Virchow | all cells arise from preexisting cells |
| unicellular organism | single celled organism |
| cytoplasm | the jellylike material that fills the cell |
| microscope | instrument that led to the discovery of cells |
| organelles | specialized membrane bound internal structures in cells |
| Cell wall | gives plant cells their shape and provides cell protection |
| Nucleus | cell brain |
