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The Cell Theory
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Notes Title: The Cell Theory (pg. 11)At top of page write the 3
Cell Theory postulates and box them.
List the following scientists, skipping 3-4 lines between each
and take notes on each scientists.
1. Hooke
2. Leeuwenhoek
3. Schleiden
4. Schwann
5. Virchow
1. All living things have cells
2. Cells come from other cells
3. Cells are the basic unit of life
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The Discovery of the Cell
Robert Hooke
• looked at thin slices of cork
(plant cells) under the
microscope.
• Named it a cell1665
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Anton van Leeuwenhoek – late 1600’s
He was the first to:
1. See and describe microorganisms
( bacteria, 1-celled creatures)
under the microscope.
2. He observed microorganisms in a
drop of pond water, dental
scrapings, etc.
Leeuwenhoek made many simple microscopes
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On the road to the cell theory...Matthias Schleiden Theodore
Schwann
German botanist
Schleiden said that all plants are made of cells.
Zoologist
Schwann said that all animals are
made of cells.
1838 1839
Together they created postulate that “A cells come from other
cells.”
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Virchow
In 1858, Rudolph Virchow said that cells could only arise
from preexisting cells.
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1. All living things have cells
Look at the pictures and notice the living organisms all have a
cell structure, while the
none living organism do not have a cell structure.
Microscopic view of a Human Skin Sample
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2. Cells come from other cells.
Cell undergoing cell division
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3. Cells are the basic unit of life
No level smaller than
the level of cell is considered
alive.
Levels of Organization• Atoms
• Elements
• Molecules
• Compounds
• Cells
• Tissue
• Organ
• Organ System
• Organisms
The pictures to the right are organelles or parts of the cell.
These organelles are
not considered alive because they are considered a
smaller level of organization than the cell.
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The Cell Theory1. All living things are composed of
cells.
2. Cells are the basic units of living
things.
3. New cells are produced from
existing cells.
