Microbial Evolution & Systematics 2

Microbial Evolution & Systematics 2 - Microbial...

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Microbial Evolution & Systematics Origin of cellular life Rise of modern cells Taxonomic techniques
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Conditions on Early Earth No significant O 2 Water, methane, carbon dioxide, nitrogen, ammonia, trace carbon monoxide and hydrogen cyanide Much hotter Early life-forms Heat-tolerant Resemble hyperthermophilic prokaryotes
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Evidence for Microbial Life on Early Earth
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Evidence for Microbial Life on Early Earth
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Evidence for Microbial Life on Early Earth Stromatolites
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Evidence for Microbial Life on Early Earth Stromatolites
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Prebiotic Accumulation of Organic Materials Synthesis of organic compounds in reducing environments Energy sources UV light Lightning Radioactivity Sugars, amino acids, purines, pyrimidines, various nucleotides, thioesters, fatty acids Polymerization : polypeptides, polynucleotides
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Prebiotic Accumulation of Organic Materials Polymerization of macromolecules Exposed surfaces as supports Clays Pyrites Basaltic glasses Stable, dry environment Synthesis, accumulation, film formation Primitive, self-replicating structures
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Primative Organisms Molecular Coding & Energy Generation Predict certain requirements Obtain energy Make copies Certain RNAs are catalytic (ribozymes) RNA life Catalytic functions (ribozymes) Genetic coding The “RNA World”
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The Modern Cell DNA to RNA to Protein Origin of DNA genetic coding molecule Saved energy Higher replication fidelity
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