Read the following statements.
a) After discovering the transformation of a non-virulent R strain to a virulent S strain, Griffith could identify the biochemical nature of the transforming principle.
b) Prior to Oswald Avery, Colin MacLeod and Maclyn McCarty's experiments, protein was thought to be the genetic material.
c) Differential labeling of bacteriophages in the Hershey and Chase experiment is based on the fact that DNA does not contain sulphur while a protein does not contain phosphorus.
d) A virus grown on radioactive sulphur contains radioactive protein but not radioactive DNA.
Identify the incorrect statement/statements?

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c only

a only

b only

d only

answer is A.

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Detailed Solution

Frederick Griffith concluded that the R strain bacteria had somehow been transformed by the heat-killed S strain bacteria. Some ‘transforming principle’, transferred from the heat-killed S strain, enabled the R strain to synthesize a smooth polysaccharide coat and become virulent. Griffith could not identify the biochemical nature of the transforming principle.

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