1. Cell Theory Early 1600s - Compound microscope invented
1. Made it possible for people to discover and learn about cells

3. B. Famous Scientists 1. Robert Hooke (1665) a. English physicist
b. Observed cork cells
c. Cork is made of many small chambers he called “cells” (after monastery rooms)
d. Inspired other scientists to search for cells in organisms

4. First person to see bacteria
2. Anton van Leeuwenhoek (1674)
Dutch businessman
First person to see tiny organisms in a drop of water (called them “animalcules”)
First person to see bacteria

5. All plants are made of cells
3. Matthias Schleiden (1838)
German botanist (plant specialist)
Concluded that
All plants are made of cells

7. 4. Theodore Schwann (1839) a. German scientist
Sideburns
a. German scientist
b. Concluded that all animals are made of cells
Not to be confused with…
cells
cells

8. 5. Rudolf Virchow (1855) German physician
Realized that all cells come from pre-existing cells

9. C. The discoveries of these scientists lead to the formation of the Cell Theory:
All living things are made up of cells.
The cell is the basic unit of structure and
function in living things.
3. All cells come from pre-existing cells.

10. ***DON’T FORGET: Organism Organ System Organ Tissue Cell Organelle
(group of similar cells)
Cell
Organelle