BIOL 1113 Lecture Notes - Cenozoic, Mesozoic, Paleozoic

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1/16/13: how did life begin, life requires interplay between dna, rna and proteins, living cells come from pre existing cells, 4 overlapping stages, nucleotides and amino acids produced prior to existence of cells, nucleotides and amino acids became polymerized to form dna, Primitive atmosphere: h2o vapor, n2, co2, small amounts of h2 and co, little free oxygen (reducing atmosphere, originally too hot for liquid water > ability of water to form 3 states important, as earth cooled, water vapor condensed to liquid water, primordial soup, atmosphere a reducing atmosphere (not inclined to break down molecules, monomers evolved and joined to form polymers, abiotic synthesis arrangement of organic molecules into biochemical (formation of biomolecules, first biomolecules, miller and urey (1953) Rna in protobionts: can store info, capacity for replication, enzymatic functions (ribozymes, fossil dating, fossils = remains and traces of past life, paleontology is the study of the fossil record, most fossils are traces of organisms embedded in sediments.

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