BIOL 1202 : Biology Exam 1 Notes
Document Summary
Theory of spontaneous generation non-life becomes life & just appears spontaneously (new species, new individuals, new populations). Louis pasteur designed experiment: built a flask with nutrium broth: if left alone, things will grow (yeast, etc. ) in two days life. If neck is later broken off, outside air can carry microorganisms into broth. spontaneous generation of life. Co2, ch4, nh3, h2, n2, hcl, h2s, h2o. Uv light from the sun (a, b, & c) Today: 20% of atmosphere is oxygen & o3 helps absorb many of the ultraviolet rays we get from the sun. Earth is about 4. 6 bya: radiometric dating of meteorites & moon rocks. Life arose about 3. 8 bya: chemical traces in rocks 3. 8 bya, fossil bacteria in rocks 3. 5 bya, no spontaneous generation now, but must have happened then. They set up an apparatus to see if any life could be generated in the lab, but it didn"t work.
