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

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