1. Cell
History
van Leeuwenhoek
Hooke

2. Cell History All life is made of cells
Cells discovered after microscope invented
1665: Robert Hooke first observed cork (dead tree bark)
Boxes he saw reminded him of tiny rooms
He named the empty boxes “cells”
Cell History

3. Cell Theory Schleiden Schwann Virchow Three Parts:
1) All organisms are made of cells
2) The cell is the most basic unit of life
3) Cells come from other cells
What’s the big problem with this theory?
Schwann
Where did the 1st ever cell come from?
Virchow

4. Cell Diversity Shape depends upon function
ex: Nerve Shape: Elongated branching
Function: Sends messages to and from brain
ex: Red Blood Shape: Disc-like shape prevents clogging
Function: Carries O2 throughout blood
ex: Skin Shape: Flat & broad; layers overlap
Function: Covers and protects the body

5. Cell Categories
1) Prokaryote: Cells without a nucleus and other membrane-bound organelles
First cells/life on Earth (oldest fossils = ~3.6 b.y.o)
AKA: Bacteria

6. 2) Eukaryote: Cells with a nucleus & membrane bound organelles
Cell Categories
2) Eukaryote: Cells with a nucleus & membrane bound organelles
More complex cells
Evolved from prokaryotes
Ex: Protists, Fungi, Plants, Animals

7. Prokaryotes vs. Eukaryotes

8. Kobe Kuiz Who first identified cells? What was he/she examining?
Name the three parts to the cell theory.
Explain how the shape of a blood cell allows it to perform it’s job better.
Which category of cells contain nuclei?
Why are bacteria considered the oldest forms of life on Earth?
How do prokaryotes and eukaryotes differ?