BIOL208 Lecture Notes - Lecture 10: Natural Selection, Stromatolite, Lipid Bilayer
29 Mar 2018
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Lec 10: origin of life on earth part 2. Bombardment of earth by rocks and ice likely vaporized water and prevented seas from forming before 4. 2 to 3. 9 billion years ago. Surface began to cool; solid rocks floated on the molten magma. Steaming gasses from cooling rock formed an atmosphere lacking oxygen. Basins filled with water and formed transient oceans. Water vapour and chemicals from volcanic eruptions (nitrogen, nitrogen oxides, carbon dioxide, methane, ammonia, hydrogen, and hydrogen sulfide) Life likely originated on earth by a set of chemical reactions that gave rise to the molecule of life. 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: Inorganic atmospheric gasses (methane, ammonia, hydrogen, water vapour , co2 and nitrogen) Organic molecules (amino acids, nitrogenous bases, sugars, and lipids) Experiments (1950s) tried to replicate conditions thought to exist on early.
