Cell Theory

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Cell Theory

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

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