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Life’s Origin and Early Evolution

Life’s Origin and Early Evolution

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Life’s Origin and Early Evolution

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  1. Life’s Origin and Early Evolution Chapter 20

  2. 20.1 In the Beginning . . . • Knowledge of modern ___________________ and ___________________ are the basis for scientific ___________________ about early events in Earth’s history

  3. Ongoing Star Formation • The Eagle ______________, photographed by the Hubble space telescope

  4. Early Earth

  5. Stanley Miller’s Experiments

  6. 20.2 How Did Cells Emerge? • We will never know for sure how the first ___________________ came to be, but we can investigate the possible steps on the road to ___________________

  7. Possible Origins of Complex Organic Compounds • Clay templates on _________________ flats; iron-sulfide rocks at hydrothermal vents on the ___________________ floor

  8. Models for Protocells • _______________________________ vesicles and ___________________ -coated clay

  9. living cells membrane-bound proto cells self-replicating system enclosed in a selectively permeable, protective lipid sphere enzymes and other proteins DNA RNA formation of protein–RNA systems, evolution of DNA formation of lipid spheres spontaneous formation of lipids, carbohydrates, amino acids, proteins, nucleotides under abiotic conditions Fig. 20-6c, p. 321

  10. Fossil Prokaryotic Cells

  11. The Rise of Eukaryotes • Oldest eukaryotic fossils: __________________ years

  12. Origins of Nucleus, ER, and Golgi Body • The ___________________ and ____________ may have arisen through modification of infoldings of ___________________

  13. Evidence of Endosymbiosis

  14. 20.5 Time Line for Life’s Origin and Evolution

  15. Lessons of Chile’s Atacama Desert • What we learn about life on Earth informs our ideas about the possibility of life ___________________

  16. Major Events in the History of Life