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1.5 Origin of cells

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Dr Speller

on 15 September 2014

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Transcript of 1.5 Origin of cells

1.5 Origin of cells
Spontaneous generation
The formation of living organisms from non living matter...
Aristotle
Paracelsus
(15th Century)
Something happened in the 17th Century that made people think a bit more...
Louis Pasteur
If cells did not spontaneously generate then where did they come from????
The first cells must have arisen from non-living material...
1. Production of carbon compounds such as sugars and amino acids
In 1953, Miller and Urey passed steam through a mixture of methane, hydrogen and ammonia - it is thought that this represented the atmosphere of early Earth. Electrical discharges mimicked lightning. The result? Amino acids and organic carbon compounds.

http://www.bbc.co.uk/programmes/p00hcbkl
2. Assembly of carbon compounds into polymers
Deep sea vents are hot and contain reduced inorganic chemicals such as iron sulphide - these chemicals represent accessible supplies of energy that could have fueled the assembly of carbon compounds into polymers.
3. Formation of membranes
Phospholipids naturally assemble into bi-layers, which then readily form vesicles. This would have allowed an internal chemistry unaffected by the external environment.
4. Development of a mechanism for inheritance.
The origin of eukaryotic cells
Endosymbiosis
Lynn Marguelis
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