BSC 2010 Chapter Notes - Chapter 25: Hydrogen Sulfide, Radiocarbon Dating, Alexander Oparin
27 Aug 2016
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Concept 25. 1: conditions on early earth made the origin of life possible. Chemical and physical processes on early earth may have produced very simple cells through a sequence of stages: 1. Abiotic synthesis of small organic molecules: 2. Joining of these small molecules into macromolecules: 3. Self-replicating rna and the dawn of natural selection: first genetic material was probably rna, not dna, rna molecules called ribozymes have been found to catalyze many different reactions. Concept 25. 2: the fossil record documents the history of life. Fossil record reveals changes in the history of life on earth. This is because the fossil record favors of species that: existed for a long time, were abundant and widespread, had hard parts. Concept 25. 3: key events in life"s history include the origins of single-celled and multicelled organisms and the colonization of land. The geologic record is divided into the archaean, the proterozoic, and the phanerozoic eons.
