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Chapter One- Intro to Biology


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Chapter One Lecture for Lab Biology

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Chapter One- Intro to Biology

  1. 1. Ch. 1 The Science of Biology
  2. 2. • What is science? • Science: an organized way of using evidence to learn about the natural world. • The goal of science is to investigate and understand the natural world and to use those explanations to make useful predictions.
  3. 3. • Thinking like a scientist: begins with observations which gives data, qualitative or quantitative (numbers) • Next, questions are asked and answers are considered, which leads to forming a hypothesis: a proposed scientific explanation for data which can be tested!!!
  4. 4. • Scientists collaborate and share data and discuss experiments. –Designing an experiment: 1. Ask a question 2. Form a hypothesis 3. Set up a controlled experiment (one variable) 4. Record and analyze data 5. Draw a conclusion 6. Repeat the experiment!!!!
  5. 5. • Manipulated variable: the one thing that changes in an experiment. (Everything else is the same.) • Responding variable: the item that changes as a result of the manipulated variable. • Example: Redi’s experiment
  6. 6. If possible, experiments should have only one manipulated variable, everything else should be kept the same or controlled. Why are controlled experiments sometimes impossible?
  7. 7. Developing Theories • If a hypothesis is supported by repeated experimentation, it may become a theory. –A theory is a well-tested explanation for a broad set of observations. –A theory may need to be changed at some point in the future to explain new observations or experimental results.
  8. 8. Scientific Laws • A scientific law is a concise statement that summarizes the results of many observations and experiments. • A scientific law doesn’t try to explain. That explanation requires a theory.
  9. 9. The Scientific Method
  10. 10. How Science Works 10
  11. 11. In review Hypothesis- an explanation Experiment- tests hypothesis Theory- an explanation that has been verified by so many different experiments that we agree it is TRUTH. Scientific Law- states what happens LAW- Boats disappear on the horizon Old hypothesis- the world is flat Current theory- the world is round
  12. 12. Biology: the study of life • Characteristics of living things: –Made of cells – Reproduce (sexual or asexual) –Universal genetic code (DNA) – Grow and develop –Obtain and use material and energy –Respond to their environment –Maintain a stable internal environment (homeostasis) –Change over time (evolve)
  13. 13. 13 Figure 1-19 on page 21 LEVELS OF BIOLOGICAL ORGANIZATION
  14. 14. 14 THE METRIC SYSTEM
  15. 15. A compound light microscope allows light to pass through an image and uses two lenses to form an image. You can see tiny stuff! 15
  16. 16. An electron microscope uses beams of electrons to form an image. 1000x more powerful! You can see parts of cells & molecules. 16