Q.

Which of the following step explains transformation with respect to Griffith experiment?

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a

Mouse inoculated with heat killed ‘S’ strain of bacteria

b

Mouse inoculated with heat killed ‘S’ strain along with normal living ‘R’ strain of bacteria cause transformation of ‘R’ strain into ‘S’ strain

c

Mouse inoculated with normal living ‘R’ strain of bacteria

d

Mouse inoculated with normal living ‘S’ strain of bacteria

answer is D.

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Detailed Solution

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Some ‘transforming principle’, transferred from the heat-killed S strain, had enabled the R strain to synthesise a smooth polysaccharide coat and become virulent. This must be due to the transfer of the genetic material.

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