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Origin of Life Ch. 14.1 & 14.2 (p.261-268)

Origin of Life Ch. 14.1 & 14.2 (p.261-268). One of the biggest questions: Where did we come from? Why life? The early debate was: Biogenesis vs. Spontaneous Generation. What do these words mean? Bio Genesis Spontaneous generate. Origin of Life Ch. 14.1 & 14.2 (p.261-268).

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Origin of Life Ch. 14.1 & 14.2 (p.261-268)

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  1. Origin of LifeCh. 14.1 & 14.2(p.261-268) One of the biggest questions: Where did we come from? Why life? The early debate was: Biogenesis vs. Spontaneous Generation What do these words mean? Bio Genesis Spontaneous generate

  2. Origin of LifeCh. 14.1 & 14.2(p.261-268) Biogenesis = all living things come from other living things • Ok but what was the first living thing? Was there a first?... • What came first the chicken or the egg? • Spontaneous generation = living things can arise from non-living things

  3. Origin of LifeCh. 14.1 & 14.2(p.261-268) Redi’s Experiment: Control: meat in open jar Experimental: meat in open jar covered by gauze Results: No maggots formed on meat covered by gauze. • Point Biogenesis

  4. Origin of LifeCh. 14.1 & 14.2(p.261-268) Spallanzani’s experiment: Control: boil broth, leave open Experimental: boil broth, seal Results: no bacteria in sealed flask • Point biogenesis

  5. Origin of LifeCh. 14.1 & 14.2(p.261-268) Pasteur’s experiment: Same as Spallazani’s but he came up with a way to leave it open. Control: boil and leave open Experimental: boil and leave open but neck is curved Results: no bacteria in curved-neck flask Biogenesis wins. But we still don’t know how started.

  6. Origin of LifeCh. 14.1 & 14.2(p.261-268) 14.2 The Earth is old. Radioactive isotope dating = very accurate measurement for age • Measures half-life decay = the time it takes half of the radioactivity to decay • Useful for things that aren’t changing: rocks, dead things

  7. Origin of LifeCh. 14.1 & 14.2(p.261-268) 14.2 Miller’s Experiment: • Put chemicals in flask that were present in early earth • Simulated conditions: water, lightning…. Results: amino acids formed by themselves • What do amino acids form?

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