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what is life ppt_ch01


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  • 1. Biology: What Is the Study of Life?
  • 2. Why Study Biology? • Two important reasons for studying Biology: – Biology is relevant to our everyday experience • Medical advances • Addressing needs of growing human population • Challenges of decreasing rate of biodiversity • Biotechnology advances
  • 3. Why Study Biology? – Biology can be controversial Figure 1-1c • Examples: – Dealing with endangered species? – Use of human fetal tissue in biomedical research? – Safety of irradiated foods?
  • 4. What is Biology? • It is the study of life. • Branch of science – A way of understanding nature. • A human endeavor – An attempt to understand, explain, integrate and describe the world of living things.
  • 5. What is Life? • Living organisms: – Highly organized and complex. – Are composed of one or more cells. – Contain a blueprint of their characteristics. – Acquire and use energy. – Carry out and control numerous reactions.
  • 6. What is Life? • Living organisms: – Grow. Insert F01_03b – Maintain constant internal environment. – Produce offspring. – Respond to environmental changes. – May evolve.
  • 7. Biology is a Branch of Science • Both an activity and body of knowledge. • A way of understanding the natural world. – Scientists make predictions and test those predictions.
  • 8. Major Themes in Biology • Evolution by Natural Selection • Inheritance • Cells • Biological Classification • Bioenergetics • Homeostasis • Ecosystems
  • 9. How is Biology studied? Insert F01-06
  • 10. Scientific Method • Begins with observations about our surroundings. • Next, ask questions about the phenomena we are observing.
  • 11. Scientific Method • Followed by generating a hypothesis. – Tentative explanation to the question.
  • 12. Scientific Method • Testing – Scientists perform tests to determine the accuracy of their hypothesis.
  • 13. Scientific Method • Explanation – It is a hypothesis that has passed the widest and most comprehensive series of tests. – Still subject to review and consideration. – May be elevated to a theory = well demonstrated principle.