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The Science of
                             Biology
                               Chapter 1




www.nerdscience.com
Science



      • Seeks to investigate, understand, and
        explain events in the natural world.
      • Seeks to make predictions about the
        natural world.
      • Begins with observation!


www.nerdscience.com
Observation
• Is the process of gathering
  information.
• Two Types:
  – Quantitative data are expressed by
    numbers. Can be counted or measured.
  – Qualitative data are descriptive and can’t
    be counted or measured.
Inference
• An assumption based on information
  previously gathered.
Hypothesis
      • Hypothesis – a proposed scientific
        explanation for a set of observations.
          – Must be testable!
          – May be disproved.
          – “Educated Guess”




www.nerdscience.com
Controlled Experiment
      • Controlled experiment – only one
        variable is changed at a time. All
        others are controlled.
          – Manipulated variable – the one you
            change.
          – Responding variable – the one that
            changes in response.




www.nerdscience.com
Spontaneous Generation
      • Spontaneous generation – the idea
        that living things can arise from non-
        living matter.




www.nerdscience.com
Redi’s Experiment
      • Francesco Redi disproved the
        hypothesis of spontaneous generation
        with the jars of meat. (see p. 9)




www.nerdscience.com
Pasteur’s Experiments
      • Louis Pasteur disproved spontaneous
        generation of microorganisms.
          – Used special s-shaped flasks.
          – Boiled the chicken broth to kill germs.




www.nerdscience.com
Theories
      • Theory – a well-supported hypothesis.
          – Unifies a broad range of observations.
          – Can be revised/replaced.
          – Ex: Theory of evolution, plate tectonics




www.nerdscience.com
What is Biology?
      • Biology – science that seeks to
        understand the living world.




www.nerdscience.com
Characteristics of Living
      Things
      •   Made of cells.
      •   Reproduce.
      •   Based on genetic code.
      •   Grow and develop.
      •   Obtain and use materials and energy.
      •   Respond to their environment.
      •   Maintain stable internal environment.
      •   Change over time.

www.nerdscience.com
…made of cells.
      • Unicellular or Multicellular.
      • Basic unit of living things.




www.nerdscience.com
…reproduce.
      • Sexual or asexual.




www.nerdscience.com
…based on genetic code.
      • DNA!




www.nerdscience.com
…grow and develop.




www.nerdscience.com
…obtain and use materials
      and energy.
      • Metabolism – the combination of
        chemical reactions through which an
        organism builds up or breaks down
        materials.




www.nerdscience.com
…responds to the
      environment.
      • Stimulus – a signal to which an
        organism responds.




www.nerdscience.com
…maintains internal balance.
      • Homeostasis – the process by which
        organisms keep internal conditions
        fairly constant.




www.nerdscience.com
…changes over time.
      • Evolution – changes in organisms over
        time.




www.nerdscience.com
Levels of Organization
      • Study the diagram on p. 21!




www.nerdscience.com
Microscopes
      • Compound Light Microscopes – allows
        light to pass through a specimen and
        magnifies the image with lenses.
      • Can be used with living specimens.




www.nerdscience.com
Microscopes
      • Images under a light microscope are
        upside-down!



                                   e
               e
www.nerdscience.com
Microscopes
      • Electron microscopes – use beams of
        electrons to produce images.
      • Three-dimensional images!




www.nerdscience.com

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Ch1

  • 1. The Science of Biology Chapter 1 www.nerdscience.com
  • 2. Science • Seeks to investigate, understand, and explain events in the natural world. • Seeks to make predictions about the natural world. • Begins with observation! www.nerdscience.com
  • 3. Observation • Is the process of gathering information. • Two Types: – Quantitative data are expressed by numbers. Can be counted or measured. – Qualitative data are descriptive and can’t be counted or measured.
  • 4. Inference • An assumption based on information previously gathered.
  • 5. Hypothesis • Hypothesis – a proposed scientific explanation for a set of observations. – Must be testable! – May be disproved. – “Educated Guess” www.nerdscience.com
  • 6. Controlled Experiment • Controlled experiment – only one variable is changed at a time. All others are controlled. – Manipulated variable – the one you change. – Responding variable – the one that changes in response. www.nerdscience.com
  • 7. Spontaneous Generation • Spontaneous generation – the idea that living things can arise from non- living matter. www.nerdscience.com
  • 8. Redi’s Experiment • Francesco Redi disproved the hypothesis of spontaneous generation with the jars of meat. (see p. 9) www.nerdscience.com
  • 9. Pasteur’s Experiments • Louis Pasteur disproved spontaneous generation of microorganisms. – Used special s-shaped flasks. – Boiled the chicken broth to kill germs. www.nerdscience.com
  • 10. Theories • Theory – a well-supported hypothesis. – Unifies a broad range of observations. – Can be revised/replaced. – Ex: Theory of evolution, plate tectonics www.nerdscience.com
  • 11. What is Biology? • Biology – science that seeks to understand the living world. www.nerdscience.com
  • 12. Characteristics of Living Things • Made of cells. • Reproduce. • Based on genetic code. • Grow and develop. • Obtain and use materials and energy. • Respond to their environment. • Maintain stable internal environment. • Change over time. www.nerdscience.com
  • 13. …made of cells. • Unicellular or Multicellular. • Basic unit of living things. www.nerdscience.com
  • 14. …reproduce. • Sexual or asexual. www.nerdscience.com
  • 15. …based on genetic code. • DNA! www.nerdscience.com
  • 17. …obtain and use materials and energy. • Metabolism – the combination of chemical reactions through which an organism builds up or breaks down materials. www.nerdscience.com
  • 18. …responds to the environment. • Stimulus – a signal to which an organism responds. www.nerdscience.com
  • 19. …maintains internal balance. • Homeostasis – the process by which organisms keep internal conditions fairly constant. www.nerdscience.com
  • 20. …changes over time. • Evolution – changes in organisms over time. www.nerdscience.com
  • 21. Levels of Organization • Study the diagram on p. 21! www.nerdscience.com
  • 22. Microscopes • Compound Light Microscopes – allows light to pass through a specimen and magnifies the image with lenses. • Can be used with living specimens. www.nerdscience.com
  • 23. Microscopes • Images under a light microscope are upside-down! e e www.nerdscience.com
  • 24. Microscopes • Electron microscopes – use beams of electrons to produce images. • Three-dimensional images! www.nerdscience.com