Transcript Ch 6: Cells

Ch 6: Cells
History of Cytology
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1665 – Robert Hooke
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1673 – Anton van Leeuwenhoek
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Viewed cork
Named “cells”
Unicellular pond organisms – named
“animalcules”
First to see bacteria and yeast
1833 – Robert Brown
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Discovered nucleus
History of Cytology
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1838 – Matthias Schleiden
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1839 – Theodor Schwann
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All plant parts are composed of cells
All animal tissues are composed of cells
1858 – Rudolph Virchow
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All cells come from other cells
Cell Theory
1)
All living things are composed of 1 or
more cells
1)
Cells are the basic unit of structure
and function
1)
All cells are produced from existing
cells
Evolution of Eukaryotic Cells
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Theory of Endosymbiosis
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one prokaryotic cell engulfed another and did not
digest it
Formed a double membrane
Evidence: Chloroplasts and mitochondria each
have their own separate DNA and can
reproduce on their own
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similar to prokaryotic cells