1. KEY CONCEPT Cells are the Basic unit of life.

2. The cell theory grew out of the work of many scientists and improvements in the microscope.
Many scientists contributed to the cell theory.

3. Robert Hooke Born: July 18, 1635
Birthplace: Freshwater, Isle of Wight, England
Died: March 3, 1703
Philosopher who was instrumental in the Scientific Revolution
Known as the “Father of Microscopy” for his work in the development of the microscope
Coined the term “cell” when looking at plant (cork) cells because they looked like monks’ rooms in a monastary

4. Anton van Leeuwenhoek Born: October 24, 1632
Birthplace: Delft, Netherlands
Died: August 30, 1723
"Father of Microbiology." best known for his contribution to the improvement of the microscope
First to observe and describe single celled organisms that he first referred to as animalcules, and which we now refer to as microorganisms

5. More was learned about cells as microscopes improved.
The cell theory grew out of the work of many scientists and improvements in the microscope.
More was learned about cells as microscopes improved.
The cell theory is a unifying concept of biology.
The Cell Theory was developed
by Schleiden & Schwann.
Virchow is known as the “Father
of Pathology” for his work on
disease and social medicine.
Animalcules as seen by
Leeuwenhoek

6. Early studies led to the development of the cell theory.
The Cell theory has three principles.
All organisms are made of cells.

7. Early studies led to the development of the cell theory.
The Cell theory has three principles.
All organisms are made of cells.
All existing cells are produced by other living cells.

8. Early studies led to the development of the cell theory.
The Cell theory has three principles.
All organisms are made of cells.
All existing cells are produced by other living cells.
The cell is the most basic unit of life.

9. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells.
All cells share certain characteristics.

10. All cells share certain characteristics. Cells tend to be microscopic.
Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells.
All cells share certain characteristics.
Cells tend to be microscopic.
Bacterium
(colored SEM; magnification 8800x)

11. All cells share certain characteristics. Cells tend to be microscopic.
Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells.
All cells share certain characteristics.
Cells tend to be microscopic.
All cells are enclosed by a membrane.
cell membrane
Bacterium
(colored SEM; magnification 8800x)

12. All cells share certain characteristics. Cells tend to be microscopic.
Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells.
All cells share certain characteristics.
Cells tend to be microscopic.
All cells are enclosed by a membrane.
All cells are filled with cytoplasm.
cell membrane
Bacterium
(colored SEM; magnification 8800x)
cytoplasm

13. There are two cell types: eukaryotic cells and prokaryotic cells.

14. There are two cell types: eukaryotic cells and prokaryotic cells.
Eukaryotic cells have a nucleus.
nucleus
cell membrane

15. There are two cell types: eukaryotic cells and prokaryotic cells.
Eukaryotic cells have a nucleus.
Prokaryotic cells do not have membrane bound organelles.
nucleus
organelles
cell membrane

16. There are two cell types: eukaryotic cells and prokaryotic cells.
Prokaryotic cells do not have a nucleus.
nucleus
organelles
cell membrane

17. There are two cell types: eukaryotic cells and prokaryotic cells.
Prokaryotic cells do not have a nucleus.
Prokaryotic cells do not have membrane-bound organelles.
nucleus
organelles
cell membrane
cytoplasm