BIO 311C_F10_Chapter 27

BIO 311C_F10_Chapter 27 - Chemical evolution and...

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Unformatted text preview: Chemical evolution and Prokaryotic cells Relevant aspects of pages from Chapter 25 (507-510) and Chapter 27 (556-561) Some slides adapted from: gasp.med.harvard.edu/micro200/Kolter/Kolter3.ppt Chemical evolution hypothesis • Process whereby simple molecules containing C, H, O, N undergo complex chemical reactions to form organic compounds with C-C bonds • Process triggered by energy source Oparin-Haldane theory • Production of small compounds – formaldehyde and HCN • Formation of amino acids, sugars, nitrogenous bases • Accumulated in “Prebiotic soup” – oceans • Formation of macromolecules • Life became possible when one of the molecules could copy itself – biological evolution Miller-Urey Experiment - 1953 Chapter 4 page 59 Miller-Urey Experiment CH4, NH3, H2 Atmosphere Results: • Identified various organic molecules: Hydrogen cyanide, formaldehyde, amino acids, hydrocarbons Abiotic synthesis of polymers • Small organic molecules – Polymerize when they are concentrated on hot sand, clay, or rock Protobionts • Are aggregates of abiotically produced molecules surrounded by a membrane or membrane-like structure • RNA molecules called ribozymes have been found to...
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This note was uploaded on 12/04/2010 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas.

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BIO 311C_F10_Chapter 27 - Chemical evolution and...

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