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Biology 3.1

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Cell Theory
- Many scientists contributed to the cell theory - More was learned about the cell as the microscope improved - The cell theory is the unifying theme of biology
3 principles of the Cell Theory
1. All organisms are made of cells 2. All existing cells are produced by living things 3. The cell is the most basic unit of life
All Cells Share Certain Characteristics
- All cells are microscopic - All cells are enclosed by a membrane - All cells are filled with cytoplasm
Eukaryote
- Nucleus - Orgenelles
Prokaryote
- No nucleus - No organelles
Robert Hooke
- First to identify cells - Named them
Leeuwenhoek
- Created better lenses - Observed cells in greater detail
Schleiden
- First to note plants were made of cells
Schwann
- Concluded all living things were made up of cells
Virchow
- Proposed cells came from other cells

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