Cell Theory

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Cell Theory
The Scientists
Cell Theory


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All life forms are
made from one or
more cells.
Cells only arise
from pre-existing
cells.
The cell is the
smallest form of
life.
1. Robert Hooke - 1665


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Used a primitive
microscope; only 30X
magnification
First described cells as
‘little boxes’ while
looking at a piece of
cork.
Called a cell, a cell
2. Anton VanLeeuwenhoek 1675
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Dutch microscope
maker
He studied his own
cheek cells
First scientist to study
LIVING cells
Leeuwenhoek=Living
Cells are the smallest
living thing.
1830’s
3. Theodor Schwann
studied animals.
He concluded
that all animals
are made of cells.
1830’s
4. Matthias Schleiden
studied plants.
He concluded that all
plants are made of
cells.
5. Rudolph Virchow - 1855
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German pathologist (Studied Diseases)
Demonstrated that cell theory applies to
diseased tissue as well as healthy tissue
He concluded that cells must come from
pre-existing cells.
Cell Theory
 Why
do we need to update
the cell theory?
MODERN CELL THEORY INCLUDES
 Genetic information (DNA) is passed on
from cell to cell.
Endosymbiosis


Endo = ????
Symbiosis = Relationship between two
different organisms.
Theory of
Endosymbiosis
1. Eukaryotic cells came from
Prokaryotic cells
2. Through symbiosis one original cell
“ate” an energy making cell and a cell
that makes its own food.
3. Evolving over time,
the two cells combined
to make ONE single
organism.
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