1. Chapter 7 Section 1
Cells

2. The Cell Theory
The Cell Theory states that all organisms are composed of similar units of organization called cells.

3. Development of Cell Theory
Theodore Schwann and Matthias Schleiden are credited with the Cell Theory

4. The Cell Theory
  1. All known living things are made up of cells.
2. The cell is structural & functional unit of all living things.
3. All cells come from pre-existing cells by division. (No spontaneous generation ).

5. Microscopes
The Cell Theory would not exist if it wasn’t for the development of the microscope and the work of others.

6. Robert Hooke
In Robert Hooke discovered cells in a piece of cork, and coined the word CELL.

7. Van Leeuwenhoek
Anton van Leeuwenhoek used his single lens microscopes and was the first person to observe bacteria and protozoa.

8. Compound light microscope Electron Microscope SEM TEM STM
Types of Microscopes
Compound light microscope
Electron Microscope
SEM
TEM
STM

9. Compound Light Microscope
Can magnify object up to 1500X
This is an onion cell at 1000x magnification.

10. Electron Microscope
Uses electron beams to magnify structures up to times.
Structures inside of the cell can be seen with electron microscope.
SEM, TEM and STM

11. Scanning Electron Microscope
Scan the surface of cell to see its 3 D shape.
Transmission Electron Microscope
Can see inside a cell and the organelles
Scanning Tunneling Microscope
Can image atoms on the surface of a molecule.

12. Compound Light Microscope
Ocular lens (eyepiece) times objective lens give total magnification

13. Two Basic Cell Types Prokaryotic Cells Mainly single celled organisms
Eukaryotic Cells Mainly multicellular organisms, although some are single celled (amoeba,algae, yeast)

14. Prokaryotic Cell Prokaryotes have no membrane bound organelles.
Example – bacteria cell

15. Eukaryotic Cells Eukaryotes – contain membrane bound organelles
Example – plant and animal cells

16. Organelles
An organelle is a small specialized structure inside of a cell.
An example of an organelle is the nucleus which controls cell functions.