1. Students Will:
Summarize the contributions scientists have made toward the cell theory.
State the cell theory.

2. Early Scientists’ Contributions

3. Robert Hooke English scientist
Observed cork cells through a compound microscope he built in 1663
Noticed the cork looked like many rectangular rooms, empty spaces he called “cells”

4. Anton von Leeuwenhoek Dutch business man
Sold cloth but built microscopes in spare time
In 1674 he used a simple, one lens microscope to look at water droplets & scrapings from teeth/gums
Found many unicellular (one-celled) organisms moving about in these things & called them animalcules—”little animals”

5. Matthias Schlieden German scientist
1838 he concluded that All plants are made of cells based on his research & the research of others

6. Theodor Schwann German scientist
1839 he concluded that All animals are made of cells
Thus,he stated that ALL living things are made of cells

7. What they discovered wasn’t the end of the story
Schleiden & Schwann had made huge discoveries about the basic unit of life, but had failed to explain where cells came from originally.
Until this point they believed in spontaneous generation that Redi & Pasteur disproved

8. Rudolf Virchow
1855, German scientist Virchow suggests that cells can only come from existing cells
“All cells come from cells,” he wrote

9. Schleiden, Schwann, Virchow, & et al developed the cell theory: the relationship b/w cells & living things.
The cell theory states the following:
1. All living things are made of cells.
2. Cells are the basic unit of structure & function in living things.
3. All cells are produced from other cells.

10. Questions... Who used the first microscope?
Who said that plants were made of cells?
Who coined the term “cell”?
Who said that all animals were made of cells?
Who said that cells must come from existing cells?