BISC 120Lg Lecture 17: Origins of Life
21 Mar 2016
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Myth 4: evolution is a theory about the origin of life: darwin did believe that all organisms on earth trace their origin to a single ancestor, what circumstances allowed life to originate/what common ancestor. Eukaryotic cells: plant cells: cell wall. Prokaryotic cell: lacks nucleus, chromosome loosely contained in cytosol, lacking organelles earliest requirements of life, boundary separating external from internal environment (cell membrane, means of replication. Conditions on early earth mode origin of life possible: chemical and physical processes on early earth may have produced very simple cells through a sequence of stages. Joining of these small molecules into macromolecules. Origin of self-replicating molecules: have enough for natural selection to act upon. Friday, october 3, 2014: water, carbon dioxide, etc, necessary to form amino acids, nucleic acids are bases that make up dna/rna. Origin in smaller molecules: cell membrane is important in fat.
