1. The Discovery of the Cell – Journal Notes

2. Organization of Life
In the 1500s we knew organisms were made of organ systems, organs and tissues. But we didn’t know the basic unit of living things.

3. Robert Hooke
Mid 1600s: observed cork (bark from cork tree) under simple microscope
Called what he saw “cells”

4. Anton van Leeuwenhoek
Late 1600s: improved the microscope and observed microorganisms.

5. Matthias Schleiden
In 1838: “all plants are made of cells”

6. Thomas Schwann
In 1839: “all living things are made of cells”

7. The Levels of Organization of Life

8. Rudolph Virchow In 1855: “all new cells came from pre-existing cells.”
-Evidence against “spontaneous generation”

9. The Cell Theory Three Parts: All organisms are made of cells.
The cell is the most basic unit of life.
All existing cells are produced by other living cells.

10. Technology
It was technology (the microscope) that allowed us to see cells.
Technology is vital to scientific advances.
As technology improves so does our understanding of life, the world, the universe…

11. The Microscope

12. Types of Cells Prokaryotic Eukaryotic
First living things on the planet.
Evolved over 3 billion years ago
Simple – No complex internal parts.
No nucleus.
DNA is circular, not in a membrane.
Known as Bacteria.
Eukaryotic
Animal, Plant, Protista, Fungi.
Have a nucleus
DNA is surrounded by the nuclear membrane.
More advanced and complex than prokaryote cells.
Have Organelles.

13. Types of Cells: Prokaryotes
Bacteria

14. Types of Cells: Eukaryotes
Protists

15. Types of Cells: Eukaryotes
Animals
Neurons
Fat Cells

16. Types of Cells: Eukaryotes
Animals
Blood Cells
Muscle Cells

17. Types of Cells: Eukaryotes
Plants
Leaf cells

18. Types of Cells: Eukaryotes
Fungi
Chytrid Fungus