1. TOPIC: Cells
AIM: Explain the cell theory and the scientists how helped develop it.
Do Now:
A new idea that is tested in a scientific experiment is known as a(an) _______.
HW: Read pgs Define New Vocabulary words on text page 38.

2. Cells
Carry out life processes
Make up living things

3. Just like bricks make up a brick house, cells make up a living thing.

5. The Cell Theory – a timeline
Robert Hooke ( 1665)
Used light microscope to look at thin slices of plant tissues -- cork
Looked empty, like monk’s chamber
Called tiny chambers “cells”

6. Used light microscope to look at thin slices of plant tissues -- cork
Looked empty, like monk’s chamber
Called tiny chambers “cells”

7. 1673 Leeuwenhoek First to view pond water organisms
First to see living microscopic orgs
Made careful sketches

8. Matthias Schleiden 1838 German Botanist (plants)
All plants looked at were made of cells, so concluded:
“All plants are made of cells.”

9. Theodore Schwann
German scientist who studied animals -- zoologist
Saw that all animals he studied were cellular so concluded:
“All animals are made of cells.”

10. Rudolf Virchow -- 1855 German physician who studied cell reproduction
“Where a cell exists, there must have been a preexisting cell…..”

11. Cell
Theory
1. Cells are the basic unit of structure in all living things.
(Living things are made of cells)

12. 2. Cells are the basic unit of function of all living things
(They carry out life processes)
3. All cells come from pre-existing cells.

13. Exceptions to the Cell Theory
Viruses:
not composed of cells
contain genetic information
reproduce inside host cell

14. Virus do not reproduce by division because they are not cells.

15. Did you know…
The common cold is a type of virus.
Viruses can be treated with antiviral drugs.
The first virus was found in both plants and animals 100 years ago.

16. Let’s summarize…
What are cell organelles?
Explain the three parts of the cell theory.
Explain why viruses are exceptions to the cell theory.

17. 1. Which statement is not a part of the cell theory?
Cells are the basic unit of structure of living things.
Cells are the basic unit of function of living things.
Cell parts such as chloroplasts are self-replicating.
Cells come from preexisting cells.

18. 2. The cell theory states that all living things are made up of
organisms
2. cells
3. tissues
4. proteins

19. 3. Which choice is NOT part of cell theory?
Cells are the basic units of life.
All living things are made of one or more cells.
All cells come from other living cells.
New cells have the same nuclei as those of pre-existing cells.

20. 4. The name “cells” was a result of the observations made by
Robert Virchow 2. Theodor Schwann
3. Robert Hooke 4. Matthias Schleidan
5. Part if the cell theory that states that all cells come pre-existing cell was a result of
3. Robert Hooke 4. Matthias Schleidan

21. 6. The man who observed many different types of plant tissues and concluded that all plants are made up of cells is
Anton van Leeuwenhoek
2. Theodor Schwann
3. Robert Hooke
4. Matthias Schleidan

22. 7. The man who observed many different types of animal tissues and concluded that all plants are made up of cells is
Anton van Leeuwenhoek
2. Theodor Schwann
3. Robert Hooke
4. Matthias Schleidan