Lect 1 scientific-method-bsc-1010_f13_jc

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  • 1. Scientific method Lecture #1, Chapter 1 by John Cozza, Biology Dept. (some material modified from Raven, Biology 9th ed.)
  • 2. Energize your clicker! • Register your clicker online at http://www1.iclicker.com/register-an-iclicker using your Panther ID! • Press and hold power button for 2 sec. • Enter frequency “AA” ( or ●) • Answer questions. •  or ● means OK. • No  or ● or means not OK. • Please help your neighbor!
  • 3. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 4. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 5. Goals of General Biology 1 Describe & discuss •Cell components and how they function •Inheritance on the molecular, organismal, and population levels •Mechanisms of and evidence for evolution •Relevant applications
  • 6. Study plan 1) Read relevant chapter(s) – Summaries, figures – Review questions 1) Participate in lecture – Interaction – Notes 1) Review lecture ASAP – Book – Study group 1) Ask Qs & use office hours
  • 7. Integrate! • Lecture • Book • Lab • PLTL • Experiences & resources
  • 8. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 9. Think—pair—share: What is life? NASA Curiosity rover on Mars
  • 10. What is life? • Movement • Organization • Compartmentalization • Growth & reproduction • Heredity • Evolution • Metabolism • Interact with environment • Homeostasis • Entropy? • Emergent properties http://environment.nationalgeographic.com/en vironment/natural-disasters/hurricane-profile/ http://www.erh.noaa.gov/okx/okxfirewx.html
  • 11. Define life? Life is a “self-sustaining chemical system capable of Darwinian evolution.” - G.F. Joyce, adopted as the NASA definition Bains, W. 2004. Many chemistries could be used to build living systems. Astrobiology
  • 12. Think—pair—share: Evidence for life on Earth? NASA Galileo spacecraft http://solarsystem.nasa.gov/multimedia/ display.cfm?IM_ID=462 Earth from Galileo spacecraft. Closest approach 960 Km
  • 13. Evidence for life on Earth? • Abundant H2O • Abundant O2 • Disequilibrium of CH4 • Absorption of red; reflectance of green • Radio wave emissions Earth from Galileo spacecraft Sagan, C. et al. 1993. A search for life on Earth from the Galileo spacecraft. Nature 365: 715-721
  • 14. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 15. Atoms to cell
  • 16. Atoms to cell Macromolecular assembly
  • 17. Cell to organism
  • 18. Organisms to biosphere ?
  • 19. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 20. Key questions • How did life begin? • What were the major innovations? • Which were likely vs. unlikely? Archean eon By Martin Schuler
  • 21. Timeline of life http://commons.wikimedia.org/wiki/File:Timeline_evolution_of_life.svg
  • 22. Timeline of life L L U U
  • 23. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 24. “Popperian” scientific method observations question hypotheses predictions experiments hypotheses supported or rejected Karl Popper 1902-1994 http://en.wikipedia.or g/wiki/Karl_Popper
  • 25. “Popperian” scientific method
  • 26. “Popperian” scientific method observations question hypotheses predictions experiments hypotheses supported or rejected
  • 27. Science has many methods! observations question hypotheses predictions experiments hypotheses supported or rejected correlations model description theory -big picture -diverse support
  • 28. Interactive question #1 A researcher is investigating the effect of moderate wine consumption on cardiovascular health. An example of a prediction associated with the study would be A.Red wine is an antioxidant. B.Red wine is popular in Italy, which has a lower rate of heart attacks than the US. C.Red wine slows atherosclerosis. D.Red wine drinkers will have fewer heart attacks than non-drinkers.
  • 29. Scientific reasoning
  • 30. Science is a social process! http://mistypedurl.com/2009/ 03/bachelors-of-science/
  • 31. Peer review
  • 32. Science of Biology outline • How to succeed • What is life? • Levels of organization • Brief history of life • Scientific method • Examples of inquiry – Evolution – Climate change
  • 33. Climate change: is it real? http://www.skepticalscience.com/solar-activity-sunspots-global-warming-advanced.htm Data from tree rings, ice cores, sediments
  • 34. Climate change: is it real? http://climate.nasa.gov/key_indicators
  • 35. http://www.worldviewofglobalwarming.org/pages/glaciers.php http://climate.nasa.gov/key_indicators
  • 36. Interactive question #2 Rising global temperatures since the late 1800s is an example of a(n) A.observation B.hypothesis C.model D.correlation E.experimental result
  • 37. Atmospheric CO2 http://climate.nasa.gov/key_indicators
  • 38. Atmospheric CO2 http://www.ethree.com/downloads/Climate%20Change%20Readings/Climate%20Science/History%20of%20Climate%20Science/xMaunaLoa.htm
  • 39. Interactive question #3 “Temperature rise in the 20th century was caused by increased [CO2]” is an example of a(n) A.observation B.hypothesis C.model D.correlation E.experimental result
  • 40. http://www.skepticalscience.com/co2-temperature-
  • 41. Interactive question #4 The relationship of CO2 to temperature since 1970 is an example of a(n) A.observation B.hypothesis C.model D.correlation E.experimental result
  • 42. Sea level rise Projection of sea level rise from 1990 to 2100, based on three different emissions scenarios. Also shown: observations of annual global sea level rise over the past half century (red line), relative to 1990. http://www.epa.gov/climatechange/science/future.html
  • 43. Interactive question #5 Scenarios for sea level rise by 2100 are an example of a(n) A.observation B.hypothesis C.model D.correlation E.experimental result
  • 44. Science of Biology summary • How to succeed • What is life? – Characteristics – Levels of organization – History • Scientific method Next: • Biological molecules