Test 2 Notes -The Tree of Life

Test 2 Notes -The Tree of Life - The Tree of Life...

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The Tree of Life Principles of Biology II Georgia Southern University LM Leege Sequence of Origin of Life à Abiotic synthesis of small organic molecules  (by def. contains carbon) àà Amino acids, nucleotides à Joining of monomers into polymers àà Proteins, nucleic acids (RNA, DNA) à Packaging into probionts  àà Membranes surrounded different chemistry à Origin of self replicating molecules àà Made inheritance possible Early Earth à Earth origin (4.6 by) àà Bombarded for several 100 million years- heat kept seas from forming: cooled by  3.9by à Chemical makeup àà Water vapor àà Releases from volcanic eruptions  ààà (N and oxides), CO2, methane (CH4), ammonia (NH3), hydrogen and hydrogen  sulfide) H escaped with cooling  àà postulated by some to be a "reducing" environment  (small molecules can be put  together instead of being taken apart) à Oldest rocks in Greenland 3.8by old  Miller-Urey experiment (1953) à Used reducing atmosphere (postulated early earth) àà Added sparks (for lightning) àà Got organic compounds in a few hours àà Amino acids formed in this "soup" àà Large molecules formed àà HCN and sugar formed: basis of nucleic acids Early Organic Compounds
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à Miller-Urey experiment à Early Earth atmosphere unclear àà Evidence of mostly CO2 and N (not enough CH4 and ammonia?) àà Not reducing or oxidizing? à
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This note was uploaded on 08/21/2008 for the course BIOL 2108 taught by Professor Leege,gleason during the Spring '08 term at Georgia Southern University .

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Test 2 Notes -The Tree of Life - The Tree of Life...

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