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The Cell Theory


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The Cell Theory

  1. 1. The Cell Theory Important people, and dates to remember about the development of the theory.
  2. 2. Anton van Leeuwenhoek <ul><li>1632-1723 </li></ul><ul><li>Made powerful microscopes out of magnifying glasses. </li></ul><ul><li>The first man to witness a live cell under a microscope. </li></ul>
  3. 3. Robert Hooke <ul><li>1635-1703 </li></ul><ul><li>When looking at cork under the microscope, he described it as like the tiny rooms that monks lived in called Cellula. </li></ul><ul><li>He was the first to call these tiny compartments “cells”. </li></ul>
  4. 4. Robert Brown <ul><li>1831 </li></ul><ul><li>Botanist. </li></ul><ul><li>Concluded from his studies that all plants had cells with a nucleus. </li></ul>
  5. 5. Three scientists are accredited for developing the theory <ul><li>1838,Matthias Schleiden- Concludes that all plants are made up of cells. </li></ul><ul><li>1839, Theodor Schwann- Concludes that all animals are made up of cells. </li></ul><ul><li>1855, Rudolf Virchow- Concludes that all cells come from pre-existing cells. </li></ul>
  6. 6. The cell theory <ul><li>All living things are made up of cells. </li></ul><ul><li>The cell is the basic structure and function in all living things. (all activities needed to sustain life occur within cells) </li></ul><ul><li>All cells come from pre-existing cells. </li></ul>
  7. 7. Exceptions <ul><li>As with all theories there are a few exceptions: </li></ul><ul><ul><li>Mitochondria and chloroplasts have their own DNA and can replicate on their own! </li></ul></ul><ul><ul><li>Viruses are not considered to be living, they cannot replicate on their own even though they may contain genetic information. </li></ul></ul><ul><ul><li>The first cell could not have come from a pre-existing cell. </li></ul></ul>
  8. 8. Why viruses are not considered to be living.
  9. 9. BLANK PAGE