Cell Theory

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Cell Theory

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The cell theory states that all living things are composed of cells, cells are the basic unit of life, and all cells come from pre-existing cells.

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Functions of All Cells

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All cells perform similar functions such as obtaining energy, removing waste, and reproducing.

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Cell

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The smallest structural and functional unit of an organism, usually microscopic, containing cytoplasm enclosed in a membrane.

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Two main types of cells

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1. Prokaryotic (no nucleus) 2. Eukaryotic (has a nucleus)

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Robert Hooke

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Observed bark of cork trees under a microscope and thought the objects looked like individual rooms. Called his discovery cells.

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Cell Theory

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1. All organisms are composed of cells. 2. Cells are the basic unit of life. 3. All cells result from the division of previously existing living cells.

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Rudolf Virchow's contribution to cell theory

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He contributed the third part of cell theory.

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Prokaryotic vs. Eukaryotic cells

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Prokaryotic cells have no nucleus, while eukaryotic cells have a nucleus.

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Three main points of cell theory

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1. All organisms are composed of cells. 2. Cells are the basic unit of life. 3. All cells result from the division of previously existing living cells.

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Anton van Leeuwenhoek's contribution to microscopy

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Developed the microscope lens to see greater magnification