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Biology - Chp 17 - How Life May Have Begun On Earth - PowerPoint
 

Biology - Chp 17 - How Life May Have Begun On Earth - PowerPoint

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    Biology - Chp 17 - How Life May Have Begun On Earth - PowerPoint Biology - Chp 17 - How Life May Have Begun On Earth - PowerPoint Presentation Transcript

    • How Life May Have Begun on Earth
    • Cell Theory
      • All living things are composed of cells
      • Cells are the basic unit of structure and function in living things
      • New cells are produced only from existing cells
    • Q: How were the first cells developed?
    • Heterotroph hypothesis
      • An explanation for how early life forms may have developed on the primitive Earth
    • Assumptions
      • Earth was hot
      • Lots of inorganic substances
        • Hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, water
      • Lots of energy
    •  
      • Energy from the Earths environment helped create chemical bonds among particles in the seas
      • This made the first organic molecules like sugars, amino acids, and nucleotides
    •  
    • Testing the Heterotroph Hypothesis
      • Stanley Miller & Harold Urey built the “Miller Urey apparatus”
      • This apparatus simulated the primitive environment
    • Miller Urey apparatus
    • More Testing of the Heterotroph Hypothesis
      • Sidney Fox conducted further experiments that joined these organic compounds into aggregates, similar to “cell-like” structures
    • It is hypothesized that…
      • Some of the large complex molecules formed aggregates which probably incorporated molecules from the seas as “food”
    • Q: What kind of nutrition is this?
      • A: Heterotroph
      • In time, these aggregates became increasingly complex and organized
      • These aggregates are considered to be “alive” when they develop the ability to reproduce
    • How modern day Earth conditions were thought to be created
      • It is thought that these heterotrophs evolved a pattern of respiration similar to the anerobic process of fermentation
    • Fermentation Pyruvic Acid + NADH alcohol + CO 2 NAD+
    •  
    • How modern day Earth conditions were thought to be created
      • Some heterotrophs evolved a means of using carbon dioxide to synthesize organic compounds
      CO 2 + H 2 O + C 6 H 12 O 6 O 2 light (Carbon Dioxide) (Water) (Sun) (Glucose) (Oxygen)
    • Q: What kind of nutrition is this?
      • A: Autotroph
    • With a Partner
      • Do questions 5, 11, 21, 34, 35, 36 in your review books