1. Ch. 7 cell structure and function Life is cellular
Important discovery in science. Revolutionized how biologist thought about living things!
Basic structure of life
With the invention and use of the microscope
Discovery of the cell
How did this happen?

2. Ch. 7 cell structure and function Life is cellular
Microscope
Two types of microscopes
Devices that produces magnified images of structure too small to see with the unaided eye
Compound light microscopes
a. Magnifies using light rays
Electron microscopes
b. Magnifies using beams of electrons

3. What differences do you see?
Compound light microscope
Electron microscope

4. Ch. 7 cell structure and function Life is cellular
History of the cell
Important Scientist!!!
Robert Hooke (1665)
The observations and conclusions of many scientists helped develop the current understanding of the cell.
Using a simple compound microscope he looked at thin slices of cork
Coined the term “cells”

5. HOOKE described the BOXES he saw in CORK as CELLS!

6. Ch. 7 cell structure and function Life is cellular
Anton van Leeuwenhoek (1674)
Observed tiny living organisms in drops of pond water

7. LEEUWENHOEK saw LIFE in WATER!!!!

8. Ch. 7 cell structure and function Life is cellular
Matthias Scheiden (1838)
Theodor Schwann
All PLANTS are made up of cells
All ANIMALS are made up of cells

9. Ch. 7 cell structure and function Life is cellular
Rudolph Virchow
All cells come from pre-existing cells

10. Ch. 7 cell structure and function Life is cellular
Cell Theory (a fundamental concept of biology )
Living things are made up of cells
Cells are the basic unit of life
New cells are produced from existing cells

11. Ch. 7 cell structure and function Life is cellular
Two categories of cells
Nucleus
Prokaryotes and Eukaryotes
Determined by the lack or presence of a nucleus
large membrane- enclosed structure that contains the cells genetic material in the form of DNA

12. Ch. 7 cell structure and function Life is cellular
Prokaryotes
Do NOT have a nucleus
“Free” DNA
Single celled organisms
Ex. bacteria
Smaller and simpler than Eukaryotes
May have flagella or cilia for mobility

14. Ch. 7 cell structure and function Life is cellular
Eukaryotes
Have a nucleus
“bound” DNA
Larger and more complex
Ex. Plants and animals
Contain many specialized structures known as organelles

17. Ch. 7 cell structure and function Life is cellular

18. Ch. 7 cell structure and function Life is cellular

19. Ch. 7 cell structure and function Life is cellular