The Griffith Experiment and DNA
15 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is one of the criteria that scientists must follow when designing their experiments?

  • The experiment must be designed to be complex and multifaceted
  • The experiment must be designed to generate subjective results
  • The experiment must be designed to be open-ended and exploratory
  • The experiment must be designed to answer a specific question (correct)

    • What type of data must a scientific experiment use?

  • Predictive data
  • Subjective data
  • Qualitative data
  • Objective data (correct)

    • What is an essential component that a house must have, analogous to a requirement in scientific experiments?

  • Decorative interior
  • Rooftop patio
  • Spiral staircase
  • Roof (correct)

    • Why is it important for scientists to follow certain rules when designing their experiments?

    <p>To ensure the value of their work within the scientific community</p> Signup and view all the answers

    What is the primary purpose of a scientific experiment?

    <p>To provide objective results</p> Signup and view all the answers

    What were Oswald Avery's objective results for the experiment?

    <p>A series of 'yes' or 'no' answers to the question, 'Did transformation occur in the absence of this factor.'</p> Signup and view all the answers

    How did Avery confirm that DNA was the transforming principle?

    <p>Destroyed DNA with deoxyribonuclease and observed the absence of transformation.</p> Signup and view all the answers

    What did Avery's experiment demonstrate about the transforming principle?

    <p>DNA was the source of genetic information.</p> Signup and view all the answers

    How did Avery rule out the presence of RNA in the transforming principle?

    <p>Destroyed RNA with a ribonuclease enzyme and observed the absence of transformation.</p> Signup and view all the answers

    What did Avery observe to determine whether transformation occurred?

    <p>Whether the R bacteria changed into S bacteria.</p> Signup and view all the answers

    What did Frederick Griffith conclude from his experiment with pneumococcus bacteria?

    <p>A transforming principle was responsible for the change in the R bacteria</p> Signup and view all the answers

    What did Oswald Avery and his colleagues discover to be the transforming principle?

    <p>Nucleic acids</p> Signup and view all the answers

    What did Avery rule out as the transforming principle before identifying nucleic acids?

    <p>Proteins</p> Signup and view all the answers

    What was the outcome of mixing live R cells with lysate from dead S cells in Avery's experiment?

    <p>The mixture yielded live S cells</p> Signup and view all the answers

    What did Griffith observe when he mixed living R cells with dead S cells?

    <p>The mice injected with the mixture died</p> Signup and view all the answers

    Study Notes

    The Griffith Experiment: Discovering the Transforming Principle

    • Frederick Griffith studied two strains of pneumococcus bacteria: S (smooth) and R (rough)
    • Mice injected with S bacteria died, while those injected with R bacteria survived
    • Griffith discovered that mixing living R cells with dead S cells caused the mice to die
    • Griffith concluded that a transforming principle was responsible for the change in the R bacteria
    • Oswald Avery continued Griffith's work to identify the transforming principle
    • Avery's list of candidates for the transforming principle included the sugar coat, proteins, and nucleic acids
    • Avery designed an experiment to test each factor separately and control for multiple variables
    • He mixed live R cells with lysate from dead S cells and found that the mixture yielded live S cells
    • Avery then tested whether the sugar coat or proteins were the transforming principle, but both were ruled out
    • Nucleic acids in the lysate were isolated and found to contain the transforming principle
    • Avery and his colleagues precipitated the nucleic acids, mixed them with water, and tested them for the transforming ability
    • The nucleic acids were confirmed to be the transforming principle, leading to the discovery that DNA is the genetic molecule

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of the Griffith Experiment and the discovery of the transforming principle with this quiz. Learn about Frederick Griffith's groundbreaking research on pneumococcus bacteria and how Oswald Avery continued the work to identify DNA as the genetic molecule.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser