Questions and Answers
Which best explains how Ivanovski's work led to a change in the germ theory?
What do hypotheses, theories, and laws have in common?
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Which is the correct order in the scientific process?
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The development of a new experimental method is most likely to change a theory if it makes it possible to:
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Based on the information provided, the statement 'traits are passed from parents to offspring independently of one another' is:
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How does a law differ from a theory?
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Which occurs directly before forming a hypothesis?
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A testable hypothesis could be formed from which question?
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In which situation would new technology be most likely to cause a change in an existing theory about new structures in a cell?
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How should you test a hypothesis?
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Study Notes
Germ Theory Evolution
- Germ theory initially attributed contagious diseases to fungi or bacteria.
- Dmitri Ivanovski discovered the tobacco mosaic virus in the 1890s by filtering extracts from diseased plants.
- His findings shifted germ theory by introducing the concept of viruses as infectious agents.
Comparisons of Hypotheses, Theories, and Laws
- Common elements among hypotheses, theories, and laws include reliance on observations.
- They all utilize data and predictions to formulate scientific understanding.
Gregor Mendel's Contributions
- Gregor Mendel utilized statistical analysis to investigate inheritance patterns.
- Contrary to prior beliefs, Mendel’s work established that traits are inherited as genes from parents, revolutionizing genetics.
- This discovery exemplifies a theory change due to the introduction of a new scientific method.
Scientific Process Sequence
- Correct order in scientific methodology is: make an observation → ask a question → form a hypothesis.
Impact of Experimental Methods on Theories
- New experimental methods can significantly influence existing theories, particularly through analyzing larger sample sizes.
Understanding Scientific Laws
- Mendel's observation that traits are passed independently is classified as a law due to widespread validation by geneticists.
- A law is defined as a statement of fact, whereas a theory serves as an explanatory framework.
Hypothesis Development
- Developing a testable question is essential prior to forming a hypothesis in research.
Formulating Testable Hypotheses
- A suitable question for creating a testable hypothesis is, "Are bass more active in the daytime than at night?" This poses a clear, investigable scenario.
Technological Advancements in Scientific Theory
- New technology can significantly alter existing theories by enabling the detection of previously undiscovered structures within cells.
Methodology for Testing Hypotheses
- The appropriate method to test a hypothesis is through performing controlled experiments, which provide reliable and replicable results.
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Description
Explore the fundamental concepts of hypotheses, theories, and laws in the context of biology. This quiz focuses on the evolution of scientific thought regarding contagious diseases, particularly the contributions of Dmitri Ivanovski and germ theory. Test your knowledge on key terms and historical developments that shaped our understanding of microorganisms.
