BIO 200: lecture 2b
5 Cards in this Set
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Panspermia
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idea that life began elsewhere and came to Erath
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Life has 2 characteristics
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1. organization
2. ability to reproduce
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What happened 3.8 billion years ago?
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Hadean Eon
-molten rock, had no free O2 (reducing high energy environment)
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4 STEPS TO LIFE ON EARLY EARTH
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1. Abiotic synthesis
2. Formation of polymers
3. Formation of protobionts
4. Origin of hereditary material
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Abiotic synthesis of organic materials
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-easier in reducing environment (shown in Miler Urey experiment)
- results: amino acids, nucleotides, sugar, ATP, lipids
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Bio 200 Lecture 2