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cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
Where do living
                                                                                             things come f...
Where do living
                                                                                         things come from?...
Where do living
                                                                                         things come from?...
Some old theories about the origin of life




        cc licensed flickr photo by Bebulaki: http://flickr.com/photos/bebula...
Tadpoles
Tadpoles




           come from mud
Maggots


cc licensed flickr photo by Clintus McGintus: http://
flickr.com/photos/clintus/2523629054/




              ca...
Spontaneous generation (abiogenesis):

a theory which explains that living
organisms can be spontaneously
created from non...
The right technology




  •Invented   in Holland in 1590
  •First cell seen/drawn by
   Robert Hooke in mid 1600s.
Looked at cork bark (made of dead cells).
The small, empty spaces that he saw
reminded him of a small room. He called
them...
The first living cells were seen
by Antonie van Leeuwenhoek.
The discovery of cells was one development that led to
the end of spontaneous generation as a viable theory.
Experimental ...
Experiment # 1 - Francesco Redi
Redi’s Experiment
Experiment # 2 - Lazzaro Spallanzani
Spallanzani’s Experiment

A




B
Spallanzani’s Experiment
                       Conclusion: Tiny
                       organisms from the air
A
         ...
Spallanzani’s Experiment
Spallanzani’s Experiment

Criticisms:
Spallanzani’s Experiment

Criticisms:


1: Spontaneous generation was believed to
require air to occur therefore it won’t
...
Spallanzani’s Experiment

Criticisms:


1: Spontaneous generation was believed to
require air to occur therefore it won’t
...
Louis Pasteur
• Boiled broth in a swan-necked flask.
• Boiled broth in a swan-necked flask.
• Dust from outside air could not get in
  because of the long, bent neck of the flas...
• Boiled broth in a swan-necked flask.
• Dust from outside air could not get in
  because of the long, bent neck of the flas...
Results:
Results:
•Broth remained clear, no bacteria found
 when examined under microscope
Results:
•Broth remained clear, no bacteria found
 when examined under microscope
•Dust collected in bend of swan neck
Results:
•Broth remained clear, no bacteria found
 when examined under microscope
•Dust collected in bend of swan neck
•If...
cc licensed flickr photo by msitua: http://flickr.com/photos/
msitua/3246137819/
Cell Theory   cc licensed flickr photo by msitua: http://flickr.com/photos/
              msitua/3246137819/
Cell Theory                          cc licensed flickr photo by msitua: http://flickr.com/photos/
                       ...
Cell Theory                      cc licensed flickr photo by msitua: http://flickr.com/photos/
                           ...
Cell Theory                       cc licensed flickr photo by msitua: http://flickr.com/photos/
                          ...
Cell theory   sept 2010
Cell theory   sept 2010
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Cell theory sept 2010

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  • Transcript of "Cell theory sept 2010"

    1. 1. cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
    2. 2. Where do living things come from? cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
    3. 3. Where do living things come from? What are they made of? cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
    4. 4. Where do living things come from? What are they made of? Answer - Cell Theory! cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
    5. 5. Some old theories about the origin of life cc licensed flickr photo by Bebulaki: http://flickr.com/photos/bebulaki/1457703975/
    6. 6. Tadpoles
    7. 7. Tadpoles come from mud
    8. 8. Maggots cc licensed flickr photo by Clintus McGintus: http:// flickr.com/photos/clintus/2523629054/ came from rotting meat cc licensed flickr photo by simplerich: http://flickr.com/photos/simplerich/ 1393197323/
    9. 9. Spontaneous generation (abiogenesis): a theory which explains that living organisms can be spontaneously created from non-living matter Not an unreasonable explanation for societies which didn’t have the right technology to look at what living things are made of.
    10. 10. The right technology •Invented in Holland in 1590 •First cell seen/drawn by Robert Hooke in mid 1600s.
    11. 11. Looked at cork bark (made of dead cells). The small, empty spaces that he saw reminded him of a small room. He called them “cells”.
    12. 12. The first living cells were seen by Antonie van Leeuwenhoek.
    13. 13. The discovery of cells was one development that led to the end of spontaneous generation as a viable theory. Experimental evidence also showed the weakness of spontaneous generation.
    14. 14. Experiment # 1 - Francesco Redi
    15. 15. Redi’s Experiment
    16. 16. Experiment # 2 - Lazzaro Spallanzani
    17. 17. Spallanzani’s Experiment A B
    18. 18. Spallanzani’s Experiment Conclusion: Tiny organisms from the air A caused growth in flask A. These organisms could not reach the broth in flask B. B
    19. 19. Spallanzani’s Experiment
    20. 20. Spallanzani’s Experiment Criticisms:
    21. 21. Spallanzani’s Experiment Criticisms: 1: Spontaneous generation was believed to require air to occur therefore it won’t occur in a sealed container.
    22. 22. Spallanzani’s Experiment Criticisms: 1: Spontaneous generation was believed to require air to occur therefore it won’t occur in a sealed container. 2: Didn’t offer any explanation about where the bacteria did come from!
    23. 23. Louis Pasteur
    24. 24. • Boiled broth in a swan-necked flask.
    25. 25. • Boiled broth in a swan-necked flask. • Dust from outside air could not get in because of the long, bent neck of the flask.
    26. 26. • Boiled broth in a swan-necked flask. • Dust from outside air could not get in because of the long, bent neck of the flask. • Left for a few days
    27. 27. Results:
    28. 28. Results: •Broth remained clear, no bacteria found when examined under microscope
    29. 29. Results: •Broth remained clear, no bacteria found when examined under microscope •Dust collected in bend of swan neck
    30. 30. Results: •Broth remained clear, no bacteria found when examined under microscope •Dust collected in bend of swan neck •If flask was broken or tipped so the broth touched the dust, the broth would go cloudy after a couple of days
    31. 31. cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
    32. 32. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
    33. 33. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life
    34. 34. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life • All cells come from pre-existing cells
    35. 35. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life • All cells come from pre-existing cells • All living things are made of cells and cell products
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