1. History of Cells

2. Robert Hooke A British scientist
Build a microscope that allowed him to
look at very tiny objects
Sliced a very thin piece of cork and
looked at it through his microscope

3. What did he see? He saw hundreds of little boxes or “honeycomb”.
Named the boxes “CELLS” or “little rooms” in Latin.

4. Anton van Leeuwenhoek A fabric merchant Looked at pond scum.
Discovered unicellular organisms.
Named them“animacules” or “little animals”.

5. Theodor Schwann 1839 Matthias Schleiden 1838
A German scientist who studied cells.
Concluded that all plant are made of cells
Drawings of the first plant and animal cells discovered by Schleiden and Schwann.
Theodor Schwann 1839
A German scientist that studied cells.
Concluded that animals are made of cells

6. Rudolf Virchow 1858 German doctor
Discovered that cells could not develop
from anything but other cells.

7. Cell Theory
1. All organisms are composed of one or more cells. 2. The cell is the basic unit of structure and function in all living things. Example: skin and nerve cells 3. All cells come from existing cells

8. Cell Characteristics All cells have 2 characteristics
1. they are surrounded by a cell membrane
2. They contain DNA (at some point)

9. Two Main Types of Cells Prokaryotic and Eukaryotic Cells
Prokaryotic Cells
Do not have a nucleus
Smaller and simpler cells like bacteria
Eukaryotic Cells
Have a nucleus
Are larger and more complex like plant and animal cells