Cell theory   sept 2010
Upcoming SlideShare
Loading in...5
×
 

Like this? Share it with your network

Share

Cell theory sept 2010

on

  • 1,194 views

 

Statistics

Views

Total Views
1,194
Views on SlideShare
1,178
Embed Views
16

Actions

Likes
0
Downloads
13
Comments
0

2 Embeds 16

http://worldofwall.wordpress.com 10
http://worldofwall.ca 6

Accessibility

Categories

Upload Details

Uploaded via as Apple Keynote

Usage Rights

CC Attribution License

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />
  • <br />

Cell theory sept 2010 Presentation Transcript

  • 1. cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
  • 2. Where do living things come from? cc licensed flickr photo by Brian Hillegas: http://flickr.com/photos/seatbelt67/502255276/
  • 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. 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. Some old theories about the origin of life cc licensed flickr photo by Bebulaki: http://flickr.com/photos/bebulaki/1457703975/
  • 6. Tadpoles
  • 7. Tadpoles come from mud
  • 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. 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. The right technology •Invented in Holland in 1590 •First cell seen/drawn by Robert Hooke in mid 1600s.
  • 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. The first living cells were seen by Antonie van Leeuwenhoek.
  • 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. Experiment # 1 - Francesco Redi
  • 15. Redi’s Experiment
  • 16. Experiment # 2 - Lazzaro Spallanzani
  • 17. Spallanzani’s Experiment A B
  • 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. Spallanzani’s Experiment
  • 20. Spallanzani’s Experiment Criticisms:
  • 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. 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. Louis Pasteur
  • 24. • Boiled broth in a swan-necked flask.
  • 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. • 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. Results:
  • 28. Results: •Broth remained clear, no bacteria found when examined under microscope
  • 29. Results: •Broth remained clear, no bacteria found when examined under microscope •Dust collected in bend of swan neck
  • 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. cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
  • 32. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
  • 33. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life
  • 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. 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