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Where Does Life Come From?

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Where Does Life Come From? - PowerPoint PPT Presentation


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Where Does Life Come From?. Origins of Life (pre-19 th c.). Abiogenesis. Heterogenesis. Lao-Tzu. Francisco Redi (1668). Lazzaro Spallanzani (1768). Louis Pasteur (1864).

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Presentation Transcript
origins of life pre 19 th c
Origins of Life (pre-19th c.)
  • Abiogenesis
  • Heterogenesis
slide10
“Never again will the doctrine of spontaneous generation recover from the mortal blow struck by this simple experiment”
primordial soup
Primordial Soup

4.4 bya

Oceans have pH of 5.8

Present: CH4, NH3, H2O, H2S, CO2, CO

Absent: O2 or O3

Highly reducing atmosphere leads to synthesis of amino acids

sidney fox
Sidney Fox

Origin of

Coacervates (protocells)

oxygen revolution
Oxygen Revolution

2.2 bya

Caused not only metabolic transition but mass extinction

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