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Early Earth & the Origin of Life
Chapter 26
Clock analogy for some key events in evolutionary history
Early Earth
Louis Pasteur
Pasteur and biogenesis of microorganisms (Layer 1)
Pasteur and biogenesis of microorganisms (Layer 2)
Pasteur and biogenesis of microorganisms (Layer 3)
The Miller-Urey experiment
RNA may have been the first genetic material
• RNA acts as a template to make polypeptides
• Polypeptides act as primitive enzymes to replicate RNA
• Exclusive relationship evolves with membrane
Hypothesis for beginning of molecular cooperation
Protobionts: Pre-cells
The History of Life
5-Kingdom System
Things are Changing…
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