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Chapter 1 notes Presentation Transcript

  • 1. CHAPTER 1 NOTES “ BIOLOGY AND YOU”
  • 2. I. Biology – study of life.
  • 3. II. Organism – any living thing.
  • 4. III. CHARACTERISTICS OF LIFE
  • 5.
    • All living things are made of cells
    • 2. All living things grow and develop .
    • 3. All living things obtain and use energy to run life processes . (metabolism)
    • 4. All living things respond to changes in their external environment. a. Homeostasis – maintenance of stable internal environment by the cells.
    • 5. All living things can reproduce .
  • 6. IV. BIOLOGY IN YOUR WORLD
  • 7. 1. Scientists are using biology to help solve the problems of today.
    • Preserving our environment.
  • 8. Improving the food supply
  • 9. Understanding the human genome
  • 10. Fighting diseases such as cancer, AIDS, and genetic diseases.
  • 11. V. SCIENTIFIC PROCESSES
  • 12.
    • Observation is the basis for scientific research.
    • 2. Stages of the scientific method:
    • a. Observing the world around you
    • b. Asking questions
    • c. Propose a hypothesis – a possible explanation for a problem.
    • d. Perform an experiment , a planned procedure to test a hypothesis.
    • e. Draw a conclusion that supports or rejects the hypothesis
  • 13.
    • Parts of an experiment: (Ex: see if plants grow better if they are given fertilizer)
    • a. Control group – the group in the experiment that receives no experimental treatment. (one plant that gets no fertilizer)
    • b. Experimental group – the group in the experiment that receives some type of experimental treatment. (one plant that gets the fertilizer.)
    • 1. independent variable – factor that is changed in an experiment. (fertilizer)
    • 2. dependent variable – variable that is measured in an experiment. (height of the plant)
  • 14.
    • 4. Theory – formed when repeated experiments confirm a hypothesis over and over again.
    • A theory unites and explains a broad range of observations.