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17 Cards in this Set
- Front
- Back
The primitive atmosphere of Earth may have favored the synthesis of organic molecules because it..
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was reducing and had energy sources in the form of lightning and UV radiation
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Life on Earth is thought to have begun ... years ago
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between 3.5 and 4 billion
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Stromatolites are...
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banded domes of sediment that contain the earliest fossils
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Coacervates are..
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droplets that self-assemble when polypeptides, nucleic acids, and polysaccharides are mixed and cooled
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What is the proposed hpothesis for the origin of genetic information?
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short RNA strands were capable of self-replicating and evolved by natural selection of molecules that were most stable and autocatlytic
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Evidence that protobions may have formed spontaneously comes from...
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the abiotic synthesis of polymers from monomers dripped onto hot rocks and clay
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Polymer formation from organic monomers may have been facilitated by
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amino acid concentration on clay particles
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According to the theory of panspermia
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organic molecules, abiotically synthesized in outer space, may have reached Earth carried on meteorites.
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The hypotheiss that life origninated in the sea is based on
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the discovery and deep-sea vents and the inhospitable asteroid-crashing environment of early Earth.
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in the five-kingdom system of classification the fungi include...
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absortptive heterotrophs
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In order to place a newly identified species into one of the five kingdoms, the first piece of information you would need to acquire is...
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the absence or presence of a nuclear membrane
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Why are the five kingdoms now organized into three domains?
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to emphasize and reflect the divergence within prokaryotes: archae and bacteria
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What did Fox do?
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produced proteinoids in the laboratory by dripping monomers onto hot sand or clay
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What did Oparin and Haldane do?
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claimed that the conditions of primitive Earth favored synthesis of organic compounds
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What did Cech do?
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discovered RNA catalysts called ribozymes
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What did Whittaker do?
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developed the five kingdom system
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What did Miller and Urey do?
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produced organic compounds in a lab apparatus
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