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bsc111 exam 1:ch 25

j.sellers:25,26,27,28,29,30

QuestionAnswer
what is evolution descent with modification
patterns of evolution observable;repeating (sunrises,tides)
processes of evolution mechanisms that produce patterns (rotation for the earth, sexual selection)
natural selection best adapted survive and reproduce, leads to variations, darwin's big hypothesis
origin of species by natural selection decades of data, accumulations of adaptations evolved new species
conditions for earliest life 1. abiotic synthesis of small molecules 2. joining of these to make macromolecules 3.packaged macros make up "protobionts" 4. origin of self-replicating molecules
Synthesis of organic cmpds on early earth 4.6 bill yrs ago- h20 mixed with volcano's co2, nh3, ch4, h, n, h2s
a.i. oparin and JBS Haldane early atmosphere was reducing environment
miller and urey abiotic synthesis of organic molecules is possible in reducing atmosphere
1.life about 3.5-4.0 bill years ago oldest fossils were from 3.5 bill in Australia
2. prokaryotes from 3.5-2.0 bill yrs ago two branches-bacteria/archaea (rich sources for fossils-stromatolites, sediment from hydrothermal vent)
3. oxygen 2.7 bill years ago challenge for life-energy from light
4. eukaryotic life 2.1 bill yrs ago arose from symbioses and exchanges between pro
*theory of endosymbiosis mitochondria and plastids were formerly prokaryotes living in larger host cells
5. multicellular eurkaryotes evolved into protists
Created by: dixxfranks
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