BIOLOGY 197FH Study Guide - Midterm Guide: Late Devonian Extinction, Great Oxygenation Event, Radioactive Decay
13 Apr 2016
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Document Summary
Biology is the study of life, living organisms, including their structure, funcion, growth, origin, evoluion and distribuion. Living things- grow, reproduce, maintain homeostasis, respond to their environment, need to consume and shed waste. The creaion of life from non-life: urey-miller experiment. Employed a model of early earth to explore the spontaneous generaion of organic molecules. Steps of early life: monomers difuse into a faty acid vesicle, monomers spontaneously polymerize and copy any template. Heat separates strands, increases membrane permeability to monomers. Pressure on the membrane drives its growth at the expense of nearby vesicles containing less polymer. Vesicles grow into tubular structures: mechanical forces cause vesicles to divide. Daughter cells inherit polymers from the parent vesicle. Polymer sequences that replicate faster will dominate the populaion. Cenancestor (luca- last universal common ancestor) likely a primiive bacterium. The great oxygenaion event (goe)- free oxygen in the atmosphere from cyanobacteria. Toxic to anaerobic organisms possible mass exincion.
