The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by...
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Transcript of The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by...
![Page 1: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/1.jpg)
The Origin of Cells1.5
![Page 2: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/2.jpg)
Understanding
Applications
Nature of Science
• Cells can only be formed by division of pre-existing cells
• The first cells must have arisen from non-living material
• The origin of eukaryotic cells can be explained by the endosymbiotic theory
• Evidence from Pasteur’s experiments that spontaneous generation of cells & organisms does not now occur on Earth
• Testing the general principles that underlie the natural world: the principle that cells only come from pre-existing cells needs to be verified.
![Page 3: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/3.jpg)
Review the Cell Theory All living things are made of cells
Cells are the smallest unit of life
All cells come from pre-existing cells
![Page 4: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/4.jpg)
Cell Theory Has been modified since the 1800’s Does not mention how the first cells
arose
![Page 5: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/5.jpg)
Spontaneous Generation Life can be
created from non-living matter
Greek philosopher Theophrastus Plant Silphium
had sprung from soil where it had never been before
![Page 6: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/6.jpg)
Spontaneus Generaton Aristotle
Wrote how insects formed from dew falling on leaves or from the hair, flesh or faeces of animals.
![Page 7: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/7.jpg)
Maggots develop on meat only if they came in contact with it.
Boiled soup in 8 containers, sealed 4 & left 4 open.
Redi
Spallanzani
![Page 8: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/8.jpg)
Was it something in the air? The containers that allowed growth were open to the air?
![Page 9: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/9.jpg)
Pasteur
1. Nutrient broth boiled.2. Sterile broth placed in 3 flasks.3. A sample of each flask was transferred to a plate
containing solid medium & incubated.4. Only flask with bacteria was _____
![Page 10: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/10.jpg)
So where did the first cells come from?
![Page 11: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/11.jpg)
Endosymbiosis
![Page 12: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/12.jpg)
![Page 13: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/13.jpg)
![Page 14: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/14.jpg)
![Page 15: The Origin of Cells 1.5. Understanding Applications Nature of Science Cells can only be formed by division of pre-existing cells The first cells must.](https://reader035.fdocuments.in/reader035/viewer/2022062407/56649f4d5503460f94c6deeb/html5/thumbnails/15.jpg)