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Chapter One- Intro to Biology
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Chapter One- Intro to Biology

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Chapter One Lecture for Lab Biology

Chapter One Lecture for Lab Biology

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  • 1. Ch. 1 The Science of Biology
  • 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. • 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. • 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. • 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. 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. 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. 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. The Scientific Method
  • 10. How Science Works 10
  • 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. 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 Figure 1-19 on page 21 LEVELS OF BIOLOGICAL ORGANIZATION
  • 14. 14 THE METRIC SYSTEM
  • 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. An electron microscope uses beams of electrons to form an image. 1000x more powerful! You can see parts of cells & molecules. 16

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