1. An Overview of Cell Theory & Structure
SBI 3C
A Theory is Born…
An Overview of Cell Theory & Structure

2. A Theory is Born… An Overview of Cell Theory and Structure
(Set up your paper like this!)

3. A Theory is Born…
Ancient Times – Aristotle's “theory of spontaneous generation”
1590 – invention of microscope (Janssen)

4. A Theory is Born…
1665 – first sketch of “cells” (Hooke)

5. A Theory is Born…
1668 – Redi’s controlled experiment shows that maggots do not “appear” in meat unless flies can land on it

6. A Theory is Born…
Microscopes continue to improve… eventually to light microscopes
1825 – “every cell is derived from a pre existing cell” (Raspail)
1839 – “All living things are composed of cells and cell products” (Schwann)

7. A Theory is Born… 1845 – “Cell is the basic unit of life” (Braun)
1858 – “Where a cell exists, there must have been a preexisting cell” (Virchow)
1860 – Louis Pasteur disproves “theory of spontaneous generation”

8. A Theory is Born… Cell Theory:
All living things are composed of one or more cells
Cells are the basic units of structure and function in all organisms
All cells come from pre-existing cells
The activity of an entire organism depends on the total activity of its independent cells

9. A Theory is Born…
How much do you remember ???
The End!!!