Genetic Material Detection and Bacteriophage Life Cycle
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Questions and Answers

In the Hershey-Chase Waring blender experiment, what was the purpose of using the blender?

  • To separate the phage protein from the bacterial cells.
  • To detach the phage protein from the phage particles.
  • To determine whether DNA or protein was the genetic material. (correct)
  • To inject phage DNA into bacterial cells.

    • What can bacteriophages be used to test?

  • The life cycle of bacterial cells.
  • Whether bacteria can produce new phages.
  • Which substance contained information to produce new phage. (correct)
  • The structure of DNA in bacteria.

    • How do bacteriophages replicate themselves inside a bacterial host?

  • By remaining inside the shell of the phage particles.
  • By injecting their genetic material into the bacterial cell. (correct)
  • By attaching to the outer surface of the bacterial cell.
  • By replicating through a process of binary fission.

    • What is the key feature of the Watson-Crick model for DNA structure?

    <p>It has a helical structure.</p> Signup and view all the answers

    What did Wilkins and Franklin use X-rays for in determining DNA patterns?

    <p>To show the helical structure of DNA.</p> Signup and view all the answers

    What did the transformation principle seek to explain?

    <p>Whether DNA or protein was the genetic material.</p> Signup and view all the answers

    What was the major component of 'nuclein' extracted by Meischer in 1869 from human white blood cells?

    <p>Deoxyribonucleic acid (DNA)</p> Signup and view all the answers

    What did the Feulgen reaction in 1923 reveal about DNA?

    <p>DNA is located almost exclusively within chromosomes</p> Signup and view all the answers

    Which scientists demonstrated bacterial transformation, implicating DNA as the substance of genes?

    <p>Avery, MacLeod, and McCarty</p> Signup and view all the answers

    What did Hershey and Chase use in their blender experiments to study DNA’s function?

    <p>Viruses (bacteriophages)</p> Signup and view all the answers

    In Hershey-Chase's Waring blender experiment, which component of the bacteriophage T2 was labeled with radioactive sulfur?

    <p>Protein coat (capsid)</p> Signup and view all the answers

    What did the blender experiments of Hershey and Chase reveal about DNA?

    <p>DNA is the genetic material that infects bacteria</p> Signup and view all the answers

    What was the main finding of Griffith's experiment with two strains of Streptococcus pneumoniae?

    <p>Heat-killed S cells transformed R cells into S cells</p> Signup and view all the answers

    What substance did Avery, MacLeod, and McCarty identify as the 'transforming principle' in their experiment?

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

    What did Avery, MacLeod, and McCarty confirm about DNA in their experiments?

    <p>It is the 'transforming principle' substance</p> Signup and view all the answers

    In the context of genetic transformation, what is the significance of R and S strains of Streptococcus pneumoniae?

    <p>S strain can transform R strain</p> Signup and view all the answers

    What did Griffith's experiments and Avery, MacLeod, and McCarty's work collectively establish about genetic material?

    <p>Genetic material can be transferred and alter characteristics</p> Signup and view all the answers

    'Transforming principle' mentioned in the context of Avery, MacLeod, and McCarty's work refers to:

    <p>'Transforming substance' for genetic alteration</p> Signup and view all the answers

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