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  • (a) Hershey and Chase carried their experiment in three steps : infection, blending, centrifugation. Explain each step.   (b) Write the conclusion and interpretation of the result they obtained.    <div style="

(a) Hershey and Chase carried their experiment in three steps : infection, blending, centrifugation. Explain each step.

  (b) Write the conclusion and interpretation of the result they obtained. 

 

 

 

 
 
 
 
 

Answers (1)

(a)

  • Infection: Radioactive phosphours labelled bacteriophages were allowed to infect E.coli growing in a culture medium, simutaneously radioactive sulphur labeeled bacteriopahge was alllowed infect E.coli growing in another culture medium.
  • Blending: As infective proceeds - the viral coats are removed from the bacteria by blender.
  • Centrifugation: Virus particles were separtaed from bacteria by spinning them in a centrifuge.

(b) Conclusion: DNA is the genetic material.

Interpretation: Sulphur labelled viral protein did not enter the bacteria during infection, whereas phosphurs labelled viral DNA entered into the bacteria to cause infection.

 

Posted by

Priyanka Kumari

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