ISB 200-2 - 10/21 Water surface vs subsurface Bedding...

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Unformatted text preview: 10/21 Water: surface vs. subsurface Bedding Structures: nanedi Valles- deeper than grand canon Comets- “deep impact”- temple-1 Planetary collision= new water Models for the origin of life- panspermia 10/24 in situ requirements: 1- proper mix of elements 2- non-biological formation of monomers 3- formation of polymers 4- structural/ functional organization: metabolism, information Primary Atmosphere • Hydrogen- H2 • Methane- CH4 • Ammonia- NH3 • Water- H2O Extremophiles • Hot springs and under-sea vents • Heat and chemical reactions • Enzymes Monomer Formation- Stanley Miller Major Issues • UV “boil-off” of uray/miller mix • CO2- rich and H2- poor • CO2- rich and up to 30% H2 Titan- like atmospheric haze Timeline: • 4.6 billion year- formation of crust • 3.8 billion years- first evidence of oceans • 3.6 billion years- first life prokaryotic heterotrophic • 3.5 billion years- chemosynthesis • 3.4 billion years- photosynthesis • 2.5- hydrogen crisis • 2.0- oxygen crisis • 1.5- eukaryotic cells • Prokaryotes: • very small cells • very simple structure: no nucleus • no complex organelles • kingdom monera 10/31/11 Photosynthesis: 6c sugars (glucose) Cyanobacteria Stromatolites- layers of cyanobacteria cells 11/2 half life- 5,730 chemosynethesis- reactions with sulfur and iron liberating chemical energy Stanley miller experiment- demonstrate non biological monomers Anaerobic metabolism- absence of oxygen Geological time scales- know the order and names Exam 3 11/4 Accessory Pigments- pigments that absorbs across middle of visible light (carotenoids-reasons for fall colors in leaves!) more oxygen= more ozone Eukaryotic Cells:...
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This note was uploaded on 01/18/2012 for the course ISB 200 taught by Professor Ralphtaggart during the Fall '09 term at Michigan State University.

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ISB 200-2 - 10/21 Water surface vs subsurface Bedding...

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