1. 1 Review What is a cell Explain What three statements make up the cell theory Infer How did the invention of the microscope help the development of the cell theory 2 Review How do microscopes work Apply Concepts What does it mean if a micrograph is “false-colored”

2. Ch 7 Cell Structure and Function
7.1 Life is Cellular

3. Robert Hooke 1665 used microscopes Looked in cork
Used the word “cell.”

4. Anton van Leeuwenhoek Early master lens maker Made early microscopes
Looked at pond
water.

5. Cell Theory The cell is the basic unit of life
All living things are made up of at least one cell
All cells come from other cells.

6. Compound Light Microscope
Light waves pass through small organisms or thin slices of larger ones
Up to 1500 times magnification
Ours magnify 400 times
Used to see bacteria
cells, and a few organelles.

7. Stains and Dyes
Increases contrast and detail
Can see more organelles.

8. Transmission Electron Microscope (TEM)
Magnifies up to 1 million times
Shows internal structures
Specimen has to be dead.

9. Scanning Electron Microscope (SEM)
Magnifies up to 1 million times
Shows the surface of the specimen
Used for cell surfaces, organelle membranes, viruses
Specimen may be living.

10. Cell Types
Eukaryote
Prokaryote

11. Prokaryotes
Lack nucleus
Lack membrane bound organelles
Bacteria.

12. Eukaryotes Have a nucleus Have membrane bound organelles
Everything but bacteria.

14. Nucleus
Contains the DNA
Control center of cell.

15. Cell Membrane Plasma Membrane
Controls what goes in and out of cell
Protective boundary
Semi fluid
Similar to skin.