History of Life

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History of Life

• Ch.14

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(14-1) Biogenesis

• All living things come from other living things
• Proved by Pasteur
• Spontaneous generation living things arise from
  nonliving things
• Ex maggots from rotting meat

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Redis Experiment
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Spallanzanis Experiment
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Pasteurs Experiment
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(14-2) Earths History

• Earth 4 billion years old
• Determined by radiometric dating
• Early conditions much different than now

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Miller-Urey Experiment
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(14-3) Roles of RNA

• Rybozyme RNA catalyst found in some unicellular
  organisms
• Promotes own replication
• Discovered by Thomas Cech (1980s)
• RNA also aids in DNA replication protein
  synthesis

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1st Life Forms

• Prokaryotes (3.5 bya) no nucleus, unicellular
• Chemosynthetic anaerobic
• Photosynthetic aerobic
• Eukaryotes (1.5-2 bya) nucleus, multicellular

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Endosymbiosis

• Mutually beneficial relationship b/w 1 organism
  another living w/in it

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