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(a) Explain with the help of Griffith's ...

(a) Explain with the help of Griffith's experiment how the seach for genetic material was conducted and what was the conclusion drawn ?
(b) How did Macleod,Mc Carty and Avery establish the Bio-Chemical nature of the so called "genetic material" identified by Griffith in his experiment.

Text Solution

Verified by Experts

For answer (a) and (b) See Q.28., Set-III, Delhi Board, 2008.
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Genetic material is DNA not protein. How did Griffith prove this?

(a) How did Griffith explain the transformation of R strain (no virulent) bacteria into S strain (virulent)? (b) Explain how MacLeod, Mc Carty and Avery determined the biochemical nature of the molecule responsible for transforming R strain bacteria into S strain bacteria.

Knowledge Check

  • Griffith performed an experiment to prove the chemical nature of genetic material. In Griffith's experiment .

    A
    the protein coat from pathogenic cell was able to transform non - pathogenic cells.
    B
    heat killed pathogenic cells caused pneumonia.
    C
    some substance from pathogenic cells was transferred to non - pathogenic cells and causes transformation.
    D
    the polysaccharide coat of bacteria caused Pheumonia.

  • Assertion :- Unequivocal proof that DNA is the genetic material came from Griffith's transformation experiment. Reason : The biochemical nature of genetic material was difined from transformation experiment.

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
    B
    If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True but the Reason is Flase.
    D
    If both Assertion & Reason are false.

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    (a) Describe the various steps of Griffith's experiment that led to the conclusion of the 'Transforming Principle'. (b) How did the chemical nature of the 'Transforming Principle' get established ?

    Define transformation in Griffith's experiment. Discuss how it helps in the identification of DNA as the genetic material.

    (a) Explain Griffith's series of experiments where he witnessed transformation in bacteria he worked with. (b) Name the scientists responsible for determining the biochemical nature of "transforming principle" in Griffith's experiments. What did they prove?

    Define transformation in Griffith's experiment. Discuss how it helps in the identifications of DNA as genetic material

    a) Write the conclusin drawn by Griffith at the end of his experiment with Streptococcus pneumoniae. b) How did O.Avery, C.MacLeod and M. McCarty prove that DNA was the genetic material? Explain.

    (a) Explain Griffith’s series of exeeriments where he witnessed transformatio in bacteria he worked with. (b) Name the scientists responsible for determining the biochemical nature I “transforming principle” in Griffith’s experiments. What did they prove ?

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