150-04lifeenergyredoxrxns[1]

150-04lifeenergyredoxrxns[1] - Foundations of Biological...

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Foundations of Biological Science I (BioSci 150) C The Origins of Life the importance of redox rxns the flow of free energy through life evidence for chemical evolution
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Foundations of Biological Science I (BioSci 150) C A look at redox reactions: Xe 2 + Y X + Ye 2 lose e-… you’re oxidized gain e-… you’re reduced 0
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Foundations of Biological Science I (BioSci 150) C light Photosynthesis : endergonic reduction The flow of Free Energy through life free energy-rich nutrients (e.g., sugar) high G content (most organisms) Respiration : exergonic oxidation H 2 O, CO 2 low G content O 2 What components in this diagram are gaining e - s? Losing them?
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Foundations of Biological Science I (BioSci 150) C By definition, nutrients are free energy-rich. The first cells would have been consumers, and so must have formed in a nutrient-rich ‘soup’. How did these nutrients accumulate before life? What did the pre-biotic earth look like?
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This note was uploaded on 04/17/2008 for the course BIO SCI 150 taught by Professor Geraldbergstrom during the Fall '08 term at Wisconsin Milwaukee.

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150-04lifeenergyredoxrxns[1] - Foundations of Biological...

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