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Cell Theory and Discovery
Cells
Cell Discovery
 Many scientists contributed to the discovery of
cells and the cell theory.
Cell Discovery
 1665 – Robert Hooke
 Described microscopic
structures of familiar
substances including
cork and he named these
structures “Cells”
Cell Discovery
 1674 – Anton van Leeuwenhoek
• Improved the polishing of lenses of short focal length to improve
magnification
Cell Discovery
 1676 – Anton van Leeuwenhoek
• Discovered and described ‘animalcules”
Cell Discovery
 1683 – Anton van Leeuwenhoek
• Discovered bacteria
Cell Discovery
 Cell Discovery
• 1838 – Matthias Schleiden
• Discovered that plant parts are made of cells
• 1839 - Theodor Schwann
• Discovered that animal parts are made of cells
• 1855 – Rudolph Virchow
• Stated that all living cells come from other living cells
 Because of Virchow’s statement about cells, the cell theory was born
Cell Theory

The Cell Theory is a unifying concept of biology.

The Cell Theory states:
1. All living things are composed of one or more cells
1. The cell is the basic unit of structure and organization of organisms
1. All cells come from preexisting cells
Cell Theory and Discovery
 Cell Theory
Cells
 All cells share certain characteristics
• All cells tend to be microscopic
• All cells are enclosed by a membrane
• All cells are filled with cytoplasm
Cells
 There are two different types of cells:
• Prokaryotic cells
• Eukaryotic cells
Cells
 Prokayrotic Cells
• Pro – Before (Greek)
• Karyon – Nucleus (Greek)
• Prokaryotic Cells
• Simple structures
• Do not have a nucleus
• Do not have membrane-bound
organelles
Cells
 Eukaryotic Cells
• Eu – True (Greek)
• Karyon – Nucleus (Greek)
• Eukaryotic Cells
• Complex structures
• Have a nucleus
• Have membrane-bound
organelles
Cells
Cells