1. *Saw empty cubicles that he called “CELLS”
The Discovery of Cells
1665 Robert Hooke
*Used a primitive microscope to examine cork
*Saw empty cubicles that he called “CELLS”

2. The Discovery of Cells 1838 Matthias Schleiden *Studied lots of plants
*Concluded that all plants are made of cells

3. All animals are composed of cells
The Discovery of Cells
1839 Theodor Schwann
All animals are composed of cells

4. All cells come from other living things.
The Discovery of Cells
1858 Rudolph Virchow
All cells come from other living things.

5. The Cell Theory All organisms are composed of cells.
The cell is the basic unit of structure and function.
All cells are produced from other cells.

6. Unicellular vs. Multicellular
Unicellular- single celled
Examples: bacteria, yeast, Amoeba, some algae
Carry out all life processes in one cell.

7. Unicellular vs. Multicellular
Multicellular- many celled
Evolved from unicellular organisms
Cells are specialized to perform certain functions
Examples: nerve cells- carry impulses
leaf cells- photosynthesize

8. Plant vs. Animal Plant Cell wall One large vacuole Chloroplasts
No centrioles
Rectangular shape
Animal
No cell wall
Small vacoules
No chloroplasts
centrioles
Various shapes

9. TYPES OF CELLS PROKARYOTIC Small No nucleus
No membrane bound organelles
Example: bacteria

10. TYPES OF CELLS EUKARYOTIC Larger More complex
Contain membrane bound organelles
Contain a nucleus
Example: plant and animal cells