Earth Sciences 1083F/G Lecture 15: Lecture 15 - The Origins of Life

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Lecture 15 the origins of life y how do we classify life: three domains: archaea, bacteria, eukarya y evolution of earth s atmosphere, 1. Initial atmosphere rich in hydrogen and helium derived from solar nebulae; burned off by solar wind or escaped the weak gravitational field: 2. Atmosphere dominated by carbon dioxide from the earth s interior, miller-urey experiment (spontaneous generation) yielded amino acids (building blocks of proteins: polymers: assumed to form through concentration, dehydration of monomers through: freezing and concentration of solution in cold environments. problem: how did we go from polymerization to genetic material: cell membrane: required to form the first isolated cell. proteins will form microspheres when dehydrated or agitated. Important properties of microspheres: y maintain separate stable phases in water y maintains electric, ph and redox gradients: reproduction. beginning of reproduction problematic in abiogenic models. rna world (the naked gene): can function as both: y 1.

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