1. Aim: How was the cell theory developed?

2. CHARACTERISTICS OF LIFE
Cells:
Metabolism:
Homeostasis:
Reproduction:

3. What instrument was vital for scientists to discover and learn about cells?
Light Microscope
A light microscope can magnify objects
up to 1000 times.
This instrument allows scientists to see
larger parts of a cell (cell membrane,
nucleus, chromosomes, etc…)

5. Anton van Leeuwenhoek 1600’s
Spiral Bacteria
Developed simple light microscopes that allowed him to examine tiny things.
Human Sperm

6. First person to use the word “cell”
Robert Hooke(1665)
What is this?
CORK CELLS
First person to use the word “cell”
First Compound
Microscope

7. ALL PLANTS ARE MADE OF CELLS
Matthias Schleiden (1838)
ALL PLANTS ARE MADE OF CELLS

8. ALL ANIMALS ARE MADE UP OF CELLS
Theodor Schwann (1838)
ALL ANIMALS ARE MADE UP OF CELLS

9. Rudolf Virchow (1858)
CELLS COME FROM
PRE-EXISTING CELLS

10. Cell theory All living things are made of cells
Cells are the basic unit of structure and function (metabolism)
New cells come from pre-existing cells A

11. What are some problems with the Cell Theory?
Are viruses living?
Where did the first cell come from?
Mitochondria and Chloroplast can reproduce on their own.

12. Viruses
They are not made up of cells,
but are they living?

13. What do you know about viruses?
They can make you very sick
They can be transmitted from person to person
There are different types of viruses

14. HOW BIG IS A VIRUS? Too small to be seen with a light microscope
They are microscopic and smaller than cells!

15. Electron Microscope Used to view extremely
small structures inside cells
& viruses
Utilizes an electron beam instead of a light beam
Can magnify up to a
million times
Subject must be dead and dry

16. How can we determine if a virus is living or non-living?
Is it made of cells?
Does it maintain homeostasis?
Does it carry out metabolism?
Does it reproduce?

17. Is a virus living or non living?
It can't reproduce,
it needs to invade
a host cell in order
to replicate

18. Introduction to Viruses Video

19. What do all cells have in common?
Cell membrane – gives shape to the cells and allows things in and out.
The cytoplasm – the jelly like material where all cell parts are found

20. Light Microscope Our microscope has a maximum magnification of 400x.
Useful for viewing larger organisms like bacteria and paramecium.

21. What happened here?

22. Why does a doctor stick a swab inside your mouth?
Cultures are used to grow bacteria. The jelly at the bottom is called agar. Why do we need agar to grow bacteria?

23. What’s the difference? BACTERIA VIRUS
Top, bacteria cell. Bottom, animal cell.

24. What if you want to separate a mixture?
Use A Centrifuge

26. Gives shape and controls what comes in and out
Janet Plowe
Cell Membrane
Gives shape and controls what comes in and out

27. Electron Microscope
Used to view extremely small organisms and viruses.
Utilizes an electron beam instead of a light beam
Lenses are electromagnets instead of glass.
Subject must be dead and dry