CELLS

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CELLS
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Cytology-study of cells
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a sense of scale..
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Single-cellular Organism

• Made of just one cell

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Multi-celluar Organism

• Made of many cells working together

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Cell Types

• There are two major types of cells
• Prokaryotic Cells
• ProBefore
• KaryonKernel or nucleus
• Eukaryotic Cells
• EuNew
• KaryonKernel or nucleus

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Cell Types

• Prokaryote
• Smaller
• Less Complex
• No nucleus
• No organelles with membranes
• Bateria

• Eukaryote
• Larger
• More Complex
• Has a nucleus
• Organelles with membranes
• Plants, Animals, Fungi, Protists

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Discovery of Cells
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Hans and Zacharias Janssen (1590)

• Made the First compound light microscope

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Robert Hooke (1663)

• Looked at a piece of cork and called what he saw
  cells

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Anton van Leeuwenhoek (1674)

• First to observe living cells

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Theodor Schwann (1838)

• All animals are made of cells

Matthias Schlieden(1838)

• All plants are made of cells

Together they said all living things are made
of cells
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Rudolf Virchow (1855)

• Stated that Cells can only come from pre-existing
  cells

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Cell Theory

1. All organisms are composed of one or more cells.
2. The cell is the basic unit of structure and
   organization od organisms.
3. All cells come from pre-existing cells.