Term
| conditions on early Earth |
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Definition
| immense heat, atmospher thick with water vapor, intense lighting, and volcanic activity, and much more UV radiation. |
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Term
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Definition
layered rock that is created when photosynthetic prokaryotes bind thin layers of sediment together then migrate to the top of the layer and start a new one, stromatolites are te earliest evedence of life on earth.
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Term
| what are the four steps in the hypothisis that explanes how simple cells were created |
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Definition
1. The nonliveing synthisis of small organic molicules such as amino acids
2. The joining of these molecules into macromolecules, like proteins
3. The packiging of these molecules into "protobionts"
4. The origin of self-replicating molecules
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Term
why was the fact that O2 was not present in the atmospher important in the abiotic synthesis of organic molecules |
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Definition
| O2 is a strong oxidizing agent, with it present it would of disrupted the chemical bonds that occured spontaniously that created molecules abioticily. |
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Term
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Definition
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Term
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Definition
| Molecules within a membrane |
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Term
| how were Protobiont's formed spontaneously |
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Definition
| Abiotic moleclues that were hydrophobic organized themselfs into a layer, much like the lipid bilayer. |
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Term
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Definition
| the hypothetic period in the evolution of life when RNA served as both rudimentary genes and cataytic molecules. |
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Term
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Definition
| RNA that can carry out a number of enzyme like functions |
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Term
| Why is it beleved that RNA were the first genes present |
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Definition
| Because short RNA strands can replicate themselfs spontaneously |
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Term
| How were polymers formed without dehydration reactions |
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Definition
| They may have come in contact with hot sand, clay, or rocks. |
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Term
| What are the importance of Miller-Urey type experiments |
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Definition
| They demonstrate that the abioltic synthesis of organic molecules is possible |
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Term
| What were the principal Compounds present in early Earth's atmosphere |
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Definition
| Nitrogen, CO2, Methane, Ammonia, Hydrogen, and Hydrogen sulfide |
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Term
| Were did the energy for the Abiotic synthesis come from |
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Definition
| lighting, and intence UV radiation |
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Term
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Definition
| The Earth's early oceans that were a soultion of organic molecules. |
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Term
| When did natural selection first occur |
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Definition
| when Self replicating RNA strands were present, those that grew and replicated more effecently had a higher fitness. |
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Term
| Were could you find the type of enviroment studied in the Miller-Urey experiments on early Earth |
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Definition
| It is hypothesized that near volcanic openings. |
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Term
A.I Oparin and J.B.S Haldane |
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Definition
| Scientists from the 1920's that proposed the experiment that Stanley Miller conducted. |
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Term
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Definition
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Term
| Why is it belived that the first form of life did not do photosyntesis? |
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Definition
| Because photosynthese is a complex process, so significant time must have elaped before life could have become complex enough for photosyntesis. |
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