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Transformation was discovered by:

1. Messelson and Stahl
2. Hershey and Chase
3. Griffith
4. Watson and Crick

Correct answer: Griffith

Solution

Griffith discovered bacterial transformation in his experiments with Streptococcus pneumoniae. He showed that a non-virulent strain could be transformed into a virulent one by exposure to material from heat-killed virulent bacteria.

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