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. (A)</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. (B)</p> Signup and view all the answers

What did the transformation principle seek to explain?

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

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

<p>Avery, MacLeod, and McCarty (B)</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) (C)</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) (A)</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 (D)</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 (C)</p> Signup and view all the answers

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

<p>DNA (C)</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 (B)</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 (A)</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 (A)</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 (C)</p> Signup and view all the answers

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