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12th Class Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank MCQs - Molecular Basis of Inheritance

  • question_answer
    The result of which of the following reaction experiments carried out by Avery et at, on Streptococcus pneumonia has proved conclusively that DNA is the genetic material?

    A) Live R-strain + DNA from S-strain + RNase

    B) Live R-strain + DNA from S-strain + DNase

    C) Live R-strain + Denatured DNA of S-strain +protease

    D) Heat killed R-strain + DNA from S-strain + DNase

    Correct Answer: B

    Solution :

    [b] R-strain is rough and harmless, while S-strain is smooth and virulent form of Streptococcus pneumoniae. In their experiment, Avery et ai, found out that only when DNA from S-type bacteria was added to a culture of R-type bacteria, R-type got converted to S-type strain. This transformation of R into S-type did not occur on addition of carbohydrate or protein from S-type bacteria. Also, when DNase enzyme was added, i.e. live R-strain + DNA (S-strain) + DNase, the transformation did not occurred. .It proved conclusively that DNA, indeed is the genetic material.


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