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| Fossilized mats similar to layered microbial mats that certain groups of prokaryotes still form today in salt marshes and warm lagoons |
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| Hot volcanic outlets in the deep sea floor |
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| The only photosynthetic prokaryotes that generate oxygen |
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| Symbiotic cells living within larger host cells |
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| Snowball Earth Hypothesis |
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| Severe ice age from 750-570mya |
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| Idea of life emerging from inanimate materials |
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| All life arises ONLY from the reproduction of pre-existing life |
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| RNA catalysts that remove introns from RNA |
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| Aggregates of abiotically produced molecules |
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| Three superkingdoms (Bacteria, Archaea, and Eukarya. No monera |
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| Made in 1969 by Robert Whittaker at Cornell University. Plantae, fungi, animalia, protista, monera. Prokaryotes in Monera |
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| (1980) Discovered that RNA is important in modern cells. Disproved theory that only proteins are catalysts |
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| (1953) Stanley Miller and Harold Urey tested Oparin-Haldane's hypothesis by creating comparable conditions for early Earth. Atmosphere was made up of Methane and Ammonia. Yielded abiotic synthesis of organic compounds. No doubt that early atmosphere had significant role in chemical reactions |
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| Oparin-Haldane Experiment |
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| (1920's) Al Oparin and JBS Haldane postulated that conditions on early Earth favored chemical reactions that synthesized organic compounds present in the early atmosphere and seas. Cannot happen today because the atmosphere is rich in oxygen produced by photosynthetic life. |
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| (1862)Overturned spontaneous generation theory. Used nutrient broth . Sterile broth=no growth. Microorganisms made growth on plate. Supports life from life thesis, or biogenesis. |
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| 1. The abiotic(non-living) synthesis or small organic molecules, such as amino acids and nucleotides |
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| The joining of these small monomers into polymers, including proteins and amino acids. |
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| The origin of self-replicating molecules that eventually made inheritance possible |
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| The packaging of all these molecules into "protobionts" (droplets with membranes that maintaned an internal chemistry different from the surroundings) |
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| What happened in the 1980's? |
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| Whittaker's 5 Kingdom System |
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| What happened in the 1920's? |
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| Oparin-Haldane experiments |
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