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