Lecture #02 - Lecture 2 Microbial Evolution Theories on the...

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1 Microbial Evolution Microbial Lecture 2 BBOM 11e Sec. 2.3, 11.1 - 11.2 Virtual Field Trip to Mars via Cal Tech/JPL Theories on the origin of life and how cells evolved Theories on the origin of life and how cells evolved Hard evidence for life on early Earth Hard evidence for life on early Earth Arrival from space during age of heavy bombardment Experiments by Stanley Miller 1957 Miller & Urey 1959 And others since Enough CH4 & NH3 to form amino acids & NA bases? Polymerization mechanisms in solution? (Mineral surfaces? Clay?) The “Organic Soup” Theory The “Organic Soup” Theory
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2 A Problem A Possible Explanation The “RNA World” Theory The “RNA World” Theory The First Self-replicating Protobionts Were RNA Life-forms This idea is supported by evidence of: 1) the central role of RNA in information transfer processes (protein synthesis—mRNA, tRNA,rRNA & DNA synthesis—RNA primer) 2) the existence of ribozymes in cells today Protometabolism: How did protobionts get energy ( ATP, PMF ) for polymer biosynthesis?
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This note was uploaded on 02/13/2008 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell University (Engineering School).

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Lecture #02 - Lecture 2 Microbial Evolution Theories on the...

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