Origin of life

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Origin of life

  1. 1. Notes: Origin of Life (pg 2)
  2. 2. Notes: Origin of Life (pg 2)• People used to believe that life arose through Spontaneous Generation (life emerging from non-living matter)
  3. 3. Notes: Origin of Life (pg 2)• People used to believe that life arose through Spontaneous Generation (life emerging from non-living matter)• Example: Belief that rotting meat turned into maggots
  4. 4. Notes: Origin of Life (pg 2)• People used to believe that life arose through Spontaneous Generation (life emerging from non-living matter)• Example: Belief that rotting meat turned into maggots• Spontaneous generation was disproved by Francesco Redi (1668) and Louis Pasteur (1850s)
  5. 5. Current theory on the origin of life• Miller and Urey experiment (1953): made a simulation of Earth’s early atmosphere (methane, ammonia, hydrogen), added water and electric shocks (to simulate lightning). After several weeks, amino acids had formed.
  6. 6. Current theory on the origin of life• Miller and Urey experiment (1953): made a simulation of Earth’s early atmosphere (methane, ammonia, hydrogen), added water and electric shocks (to simulate lightning). After several weeks, amino acids had formed.• More recent experiments have produced bases found in DNA
  7. 7. Current theory on the origin of life• Miller and Urey experiment (1953): made a simulation of Earth’s early atmosphere (methane, ammonia, hydrogen), added water and electric shocks (to simulate lightning). After several weeks, amino acids had formed.• More recent experiments have produced bases found in DNA• Under certain conditions, large organic molecules form microspheres, which have selectively permeable membranes. Over millions of years, these microspheres may have evolved into cells.

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