GLY-1102 Lecture Notes - Lecture 11: Cnidaria, Tribrachidium, Archean
17 Sep 2018
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Molecular oxygen being produced in atmos by photolysis of water (water + sun. Co(cid:374)su(cid:373)ed as(cid:395)ui(cid:272)kly as it was p(cid:396)odu(cid:272)ed did(cid:374)"t a(cid:272)(cid:272)u(cid:373)ulate. Decrease consumption rates, ie neutralize reactants ( iron, sulfur, methane) Respire organic matter in the presence of oxygen to get energy. Organic matter + ox =waste products (co2 and water. Also require organic matter, but in absence of ox. Earliest heterotrophs may have been methanogenic archaea (thermophiles) Relatively simple metabolic process of splitting apartsimple organic molecules. Co2 + water + light = ch2o + o2. Co2 + h2s + light = ch2o + 2s + water. End of archean could have been first mass extinction event, as oxygen became a poison to most life at the time. Absorbtion of ultravioletlight (uv-c) by molecular oxygen produces highly reactive atomic ox. Varved lake deposits (varves = lines of alternating rock and clay) laminated deposits. Increased continental area caused increased weathering (co2 emoved from atmosphere)
