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.You need to login to perform this action.
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