Week 4, Lecture 1, Origin of Life

Week 4, Lecture 1, Origin of Life - Origin of Life Early...

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Origin of Life Early Earth • 4.7 billion years ago - gases formed earth • 4.1 billion years ago - crust cooled, solidified Non living ⎯→ Living? Prokaryote ⎯→ Eukaryote? Living ⎯→ Diversity? Non living ⎯→ Living 1) Chemical evolution - anaerobic atmosphere, chemical soup H 2 , H 2 O, NH 3 , CH 4 , CO, N 2 , amino acids, lipids, sugars, nucleotides ATP, HCN ⎯→ Fig. 2.8 Chemical evolution Monomers to polymers Nonliving to living Chemical selection Non living ⎯→ Living 2) Macromolecules produced - needs high concentrations of monomers - small pools concentrate “soup” on hot clay - minerals act as co-binders - RNA may self assemble into ribozymes - polypeptides, nucleic acids (no enzymes) Chemical evolution Monomers to polymers Nonliving to living Chemical selection Non living ⎯→ Living 3) Nonliving molecules with some “life” traits - microspheres: proteins and water - picks up lipid layer and concentrates - grows and buds; electrical potentials - highly stable; lasts 6 years in lab cultures
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This note was uploaded on 04/18/2010 for the course BIOLOGY 1223 taught by Professor Gardiner/lajoie during the Fall '09 term at UWO.

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Week 4, Lecture 1, Origin of Life - Origin of Life Early...

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