Cell Theory
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Cell Theory

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Cell Theory Presentation Transcript

  • 1. The Cell Theory
  • 2. The Cell Theory
    • The development and refinement of magnifying lenses and light microscopes made the observation and description of microscopic organisms and living cells possible.
  • 3. The Cell Theory
    • Many scientists contributed to the cell theory
  • 4. The Cell Theory
    • 3 parts to the cell theory:
      • 1. The cell is the basic unit of life
      • 2. All living things are made of cells
      • 3. Cells come from pre-existing cells
  • 5. Anton van Leeuwenheok (1632-1723)
    • He invented the first microscope.
    • Dutch scientist who was the first to see bacteria and protists.
  • 6. Leeuwenhoek’s Microscope
  • 7. Robert Hooke (1635-1703)
    • He observed that cork has small regular boxes in it that he called “cells”.
  • 8. Hooke’s cork cells
  • 9. Theodor Schwann and Matthais Schleiden stated that all living things are made of cells. (1839) Matthais Schleiden (plants) Theodor Schwann (animals)
  • 10. Rudolph Virchow (1821-1902)
    • German scientist who discovered that all cells come from pre-existing cells.
  • 11. The Cell Theory
    • Continued advances in microscopy allowed observation of cell organelles and structure.
  • 12. Electron Microscopes
    • Scanning Electron Microscope (SEM): bounces electrons off of a whole gold-coated sample to create vivid 3-D images
    • Transmission Electron Microscope (TEM): bounces electrons off of a sliced sample to create very detailed images
  • 13. Questions...
    • Who used the first microscope?
    • Who said that plants were made of cells?
    • Who coined the term “cell”?
    • Who said that all animals were made of cells?
    • Who said that cells must come from existing cells?
  • 14. State the cell theory...
    • The cell is the basic unit of structure .
    • The cell is the basic unit of function .
    • All cells arise from pre-existing cells .