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Chapter One Introduction: Themes in the Study of Life

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Chapter One Introduction: Themes in the Study of Life

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    1. Chapter One Introduction: Themes in the Study of Life

    2. Inquiring About the World of Life What is biology? Biologists ask questions such as: How a single cell develops into an organism How does the human body work How living things interact in communities What are some characteristics of life?

    3. Properties of life

    4. Theme: The biological hierarchy Life can be studied at different levels from simple to complex The study of life can be divided into different levels of biological organization

    5. Levels of biological organization

    6. Theme: Organisms interact with their environments

    7. Theme: Cells are an organism’s basic units of structure and function The cell is What do cells have in common? The ability of cells to divide is the basis of all reproduction, growth, and repair of multicellular organisms

    8. What are the differences between a eukaryotic and prokaryotic cell?

    9. Theme: The continuity of life is based on heritable information in the form of DNA Chromosomes contain most of a cell’s genetic material in the form of DNA DNA is the substance of genes Genes are?

    10. DNA: The genetic material

    11. Theme: Feedback mechanisms regulate biological systems

    12. The Three Domains of Life The three-domain system is currently used, and replaces the old five-kingdom system Domain Bacteria and Domain Archaea comprise the ___________________ Domain Eukarya comprises all ___________ organisms

    13. The three domains of life

    14. The three domains of life

    15. Hypothesis-Based Science Observations can lead us to ask questions and propose hypothetical explanations called ____________ Leads to predictions that can be tested by observation or experimentation

    16. A campground example of hypothesis-based inquiry

    17. A campground example of hypothesis-based inquiry

    18. A Closer Look at Hypotheses in Scientific Inquiry A hypothesis must be __________ and __________ Failure to falsify a hypothesis does not prove that hypothesis

    19. The Myth of the Scientific Method The scientific method is an idealized process of inquiry Hypothesis-based science is based on the “textbook” scientific method but rarely follows all the ordered steps

    20. Designing Controlled Experiments A controlled experiment compares an experimental group with a control group A controlled experiment means that control groups are used to cancel the effects of unwanted variables

    21. Limitations of Science In science, observations and experimental results must be __________ Science cannot support or falsify supernatural explanations In the context of science, a ____________ is: Broader in scope than a hypothesis Can lead to new testable hypotheses Supported by a large body of evidence

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