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TRANSCRIPT
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Robert Hooke
• Cork Cells
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Leeuwenhoek
• Powerful Microscope (for his time)– Rotifers
– Human blood cell
– Bacteria
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The Cell Theory
• All organisms are made of one or more cells.• All the life functions of organisms occur
within cells. • All cells come from already existing cells.
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Two Categories of Cells
1. Prokaryotic
2. Eukaryotic
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Prokaryotic Cells
• No nucleus• DNA floats around in the cell
• Found in single-cells organisms• Bacteria
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Eukaryotic Cells
• Have a nucleus• Have organelles• Found in multicellular organisms
• Fungi, dogs, humans, etc
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Organelles
Amoeba Sisters- Prokaryotes and Eukaryotes
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Diversity of Cells
• All cells share functions such as obtaining and using energy, responding to the environment, and reproducing
• Cells differ with unique structure and function
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Skin Cells
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Muscle Cells
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Liver Cells
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Neurons
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Blood Cells
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Viruses
• Not prokaryotes or eukaryotes• Have DNA, but are not considered living• Viruses infect host cells, and make the host
cells make copies of the virus DNA