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3-2 Cell Features Ppt

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This presentation correltates to section 3-2 of Holt Biology ed. 2004

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3-2 Cell Features Ppt

  1. 1. Section 3-2 Heather Sullivan- FRHSD
  2. 17. <ul><li>List the three parts of the cell theory. </li></ul><ul><li>Determine why cells must be relatively small. </li></ul><ul><li>Compare the structure of prokaryotic cells </li></ul><ul><li>with that of eukaryotic cells. </li></ul><ul><li>Describe the structure of cell membranes. </li></ul>
  3. 18. <ul><li>The cell theory is one of the great triumphs in biology </li></ul><ul><li>The introduction of the microscope made the study of the cell possible </li></ul><ul><li>Earliest microscopes invented around 1590 by an unknown Dutch spectacle maker </li></ul>
  4. 19. <ul><li>In 1665, he described and illustrated some pores and box-like structures in a thin slice of a piece of cork. </li></ul><ul><li>He called these structures “cells,” ( cella = small room; like prisoner's cell, or honeycomb cell) </li></ul>
  5. 20. <ul><li>CORK CELL SKETCHES </li></ul><ul><li>HOOKE’S MICROSCOPE </li></ul>
  6. 21. <ul><li>In the 1820s and 1830s microscopes began to be manufactured in England, France, Germany, and Austria and soon became a regular part of the equipment of the better laboratories </li></ul><ul><li>That led to the discovery that “cells” were not empty but that contain “ cytoplasm ” </li></ul><ul><li>In 1831 Brown realized that the nucleus was a regular feature of all cells </li></ul>
  7. 22. <ul><li>By the end of the 1830s there were two major questions: </li></ul><ul><ul><li>What was the role of the cell in the organism </li></ul></ul><ul><ul><li>How do new cells originate? </li></ul></ul>
  8. 23. <ul><li>Matthias Schleiden (German, 1804-1881) </li></ul><ul><li>Originally a lawyer, then a botanist plant scientist) </li></ul><ul><li>Described as very moody and arrogant. Depressive character- even attempted suicide </li></ul>
  9. 24. <ul><li>Theodor Schwann (German 1810-1882) </li></ul><ul><li>Religious & Simple-minded </li></ul><ul><li>Tidbits… </li></ul><ul><ul><li>Discovered Pepsin (digestive enzyme ) </li></ul></ul><ul><ul><li>Coined the term Metabolism </li></ul></ul>
  10. 25. <ul><li>The evolution of the cell theory is one of the best examples of progress of science based on large number of observations </li></ul><ul><li>Because, although cells had been observed, many scientists failed to realize its importance to life </li></ul><ul><li>Many of their initial ideas were totally incorrect; yet, they stimulated a great deal of scientific research that led to other great discoveries </li></ul>
  11. 26. <ul><li>It required the development of better and better instruments (microscopes) </li></ul><ul><li>The entire theory was based on a simple observation. Almost no experimentation was needed </li></ul><ul><li>It is a good example that great, basic ideas escape the mind of most people (people lose sight of the forest when they are too busy focusing on the trees) </li></ul>
  12. 27. <ul><li>Cells are the smallest unit of life </li></ul><ul><li>All living things are made up of cells </li></ul><ul><li>Cells come from existing cells </li></ul><ul><li>Plant & Animal Cells have the same basic parts: </li></ul><ul><ul><li>Membrane </li></ul></ul><ul><ul><li>Nucleus </li></ul></ul><ul><ul><li>Cytoplasm </li></ul></ul>