1. History of Cell Biology and Types of Cells
Pgs

2. Cells Smallest unit that can perform life processes Random Facts
Average human is composed of 100 trillion cells
It would take 50 cells to cover the dot of an “i” on your paper

3. Who discovered cells?

4. 1. Hooke, 1665 Discovered cells while looking at cork (plant cells)
Described them as tiny boxes or rooms
“cell” means little room in Latin
Thought cells only existed in plants and fungi

5. 2. Leuwenhoek, 1673 Observed pond scum & found single-celled organisms
One of the first to look at living cells
He called them “animalcules”

6. 150-200 Year Gap….Not much was discovered
Between the Hooke/Leuwenhoek discoveries and the mid 19th century, very little cell advancements were made.

7. 3. Schleiden, 1838 German botanist
Stated that all plants are made up of cells

8. 4. Schwann, 1839 German Physiologist
Stated that all animals are made up of cells

9. 5. Virchow, 1858 German Physician Studied cellular pathology
Concluded that cells must come from existing cells

10. Cell Theory
1. All living things are made up of one or more cells (Schleiden & Schwann )

11. Cell Theory
2. Cells are the basic units of structure and function in living things.
(Schleiden & Schwann )

12. Cell Theory:
3. All cells are produced by the division of existing cells

13. Cell Types and Common Parts

14. TPS: What differences do you notice?

15. Type of Cells Type of Cells
Prokaryotic: lack membrane-bound organelles
Unicellular
Simple
Capsule, cell wall, cell membrane
No nucleus
Cytoplasm (also in eukaryotes)
Ribosomes (also in eukaryotes)
Cilia, flagella (for movement) (also in eukaryotes)
Oldest living cells
Ex: bacteria

16. Prokaryotic

17. Type of Cells Type of Cells
Eukaryotic: contain a membrane-bound nucleus and organelles
Unicellular and multicellular
More complex
Ex: Animal and plant cells

18. Size difference
Prokaryote
Eukaryote

19. All cells have the following in common
1. Plasma (cell) Membrane
Acts as a barrier to the outside world
Semi-permeable: allows only certain materials to leave and enter

20. All cells have the following in common
2. Cytoplasm
Gel-like substance
Fills space in the cell
Most reactions happen here
3. DNA
Regulates cells function
Stores and transfers genetic
information