BIOL 1202 Lecture Notes - Ammonia, Purified Water, Ultraviolet
23 Sep 2014
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The experiment of miller & urey: purified water mixes with ch4, nh3, h2, & h2o + gases of primeval atmosphere. Lightning storm (electric spark) gave electricity: after a few days, water changed colors. Conclusion: simple biological (organic) molecules were formed after a few days. ***earth is 4. 6 billion years old (know the number of zeros in a billion) ***4 billion years ago, the 1st species was known. ***cell theory existing cells come from preexisting cells. Molten at first, once cooled with water, life formed. Atmosphere: co2, ch4, nh3, n2, h2o, hcl, h2s. Similar to jupiter today: frequent storms with lots of lightning - energy, frequent volcanic eruption - energy, frequent meteor impacts - energy, uv light from the sun, no ozone layer. Radiometric dating of meteorites and moon rocks (how we can tell) Chemical traces in rocks 3. 8 billion years. Fossil bacteria in rocks 3. 5 billion years. It has a half-life of 1. 25 billion years.
