PSY 1001 Chapter Notes - Chapter 15: Complete Group, Supercontinent, Ribosomal Rna
10 Sep 2017
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15. 1 early earth and origin of life the big bang . Huge cloud of dust swirled around the sun and all the rocks and dust came together with the force of gravity to form what we now know as the planets. First atmosphere had thick water vapor and was filled with nitrogen, oxides, carbon dioxide, methane, ammonia, hydrogen, and hydrogen sulfide. First prokaryote found 3. 5 billion years ago, but because they were so complex, scientists think there was simpler life on earth 3. 9 billion years ago. People used to believe that life came from nonliving things, but louis. Oparin-haldane hypothesis - before prokaryotes formed and began releasing o2 into the air (disrupts chemical bonds), earth had an electron-adding (reducing) atmosphere. First proof that organic molecules could have come from inorganic. Other hypotheses are that extreme environments and meteorites were the molecules source of organic molecules. Enzymes are what help build polymerscould this happen without.
