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Ch 6: Cells History of Cytology 1665 – Robert Hooke 1673 – Anton van Leeuwenhoek Viewed cork Named “cells” Unicellular pond organisms – named “animalcules” First to see bacteria and yeast 1833 – Robert Brown Discovered nucleus History of Cytology 1838 – Matthias Schleiden 1839 – Theodor Schwann All plant parts are composed of cells All animal tissues are composed of cells 1858 – Rudolph Virchow 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 Theory of Endosymbiosis 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 similar to prokaryotic cells
