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NEET Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank Self Evaluation Test - Molecular Basis of Inheritance

  • question_answer
    From the experiments carried out by Avery, Macleod and McCarty by using various enzymes, which of the following results prominently proved that DNA is the transforming material?

    A) DNA of heat killed 'S' + R type + DNAase \[\to \]virulent strain

    B)                    DNA of heat killed 'S'+R type + RNAase \[\to \]virulent strain

    C)                    DNA of heat killed' S' + R type\[\to \]virulent strain

    D)                    DNA of heat killed 'S'+R type + Protease\[\to \]virulent strain

    Correct Answer: A

    Solution :

    [a] Heat-killed S-type bacteria caused a transformation of the R-type bacteria into S-type bacteria but he was not able to understand the cause of this bacterial transformation. The occurrence of living 19 S-type virulent bacteria is possible only by their formation from R-type non-virulent bacteria, which pick up the trait of virulence from dead bacteria. This phenomenon is called Griffith effect or transformation. Griffith proposed that a chemical substance released by heat killed bacteria changed the R-bacteria into S-bacteria which was a permanent genetic change.


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