Week 9 Discussion.pdf - Week 9 Discussion 1 Lecture 14...

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Week $" **-Discussion
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1. 5Lecture °± )*iPcroObiKLGGl°Pcology±±
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++.Earth’s biological evolution °KLGGrthformedKLGGObout4.5ObyKLGG ²irstPcellulKLGGrlifewKLGGs3.8ObyKLGG ()otsofmetKLGGOboliPcdiversity! ()=>99³´=lKLGGstuniversKLGGlPcommonKLGGnPcestor
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What was the metabolic phenotype of the first primitive cells%%( 9:55triPctlyKLGGnKLGGeroObiPc(oObligKLGGteKLGGnKLGGeroObes)ObePcKLGGuseoxygenwKLGGs PconsideredtoxiPc(no,-( 2 ) ()ikelyPchemolithotrophiPcormethKLGGnogeniPc ż =>99seofinorgKLGGniPcPcompoundsforPcKLGGrObon,energy,KLGGnd elePctrons 9:55urfKLGGPcePconditionslikelyinhospitKLGGObletosupportlife ż ()ikelyevolvedinhydrothermKLGGlventsKLGGttheObottomofthe oPceKLGGn
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''*vailable redox couples to support life on early ++.Earth 9:55upportmethKLGGnogenesishypothesis: ż ³,-( 2 KLGGndµ 2 KLGGrehighlyKLGGObundKLGGnt ĺ suggestsKLGGutotrophy ´noxiPc-reduPcedmetKLGGlswereKLGGObundKLGGnt,soPcKLGGnusereduPcedmetKLGGls KLGGselePctron donors(PchemolithoKLGGutotrophy) ż 9:55 0 reduPctionPcoupledtoµ 2 produPction ż # 2 oxidGtion (e- donor) drives´<=88450synthesisKLGGnd³,-( 2 fixKLGGtion ż ±norgKLGGniPcelePctrondonorPcoupledtoinorgKLGGniPcelePctronKLGGPcPceptor ż 9:55uggestsKLGGPcidophiliPcmodeofexistenPceObePcKLGGuseoPceKLGGnwKLGGsveryKLGGPcidiPc ż ³onsistentwithmethKLGGnogenesisObePcKLGGusehydrogenisfKLGGvorede-donor <=88hefixedorgKLGGniPcPcKLGGrObonPcouldObeutilizedObyotherevolvingmetKLGGObolismsto supportheterotrophiPcorKLGGutotrophiPcgrowth
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**-Deep ocean hydrothermal vent hypothesis ´mplesupplyofreduPcedinorgKLGGniPcPcompounds(possiOble elePctrondonors) 9:55uperPcritiPcKLGGlheKLGGtedwKLGGterspewedout ż ¶ringsinorgKLGGniPcPcompoundsoutfromPcrust(³,-( 2 ,*+&i,²e)
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