BISC 1112 Chapter Notes - Chapter 25: Chloroplast, Endosymbiont, Cambrian Explosion
31 Mar 2017
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Macroevolution: the broad pattern of evolution above the species level. Ex. emergence of terrestrial vertebrates through a series of speciation events. 25. 1: conditions on early earth made the origin of life possible; chemical and physical processes could have produced simple cells through a sequence of four main stages. Nonliving synthesis of small organic molecules, such as amino acids and nitrogenous bases. Miller-urey experiment: created laboratory conditions similar to that of young earth"s atmospheric conditions; apparatus yielded variety of amino acids and other organic compounds found in organisms today. Another hypothesis: organic compounds first produced in deep-sea hydrothermal vents. Hydrothermal vents: areas on the seafloor where heated water and minerals gush from earth"s interior into the ocean. Black smokers: release water so hot that organic compounds formed there may have been unstable. Alkaline vents: release water that his a high ph and is warm (instead of hot) so may have been a more suitable environment for the origin of life.
