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Francois Jacob and Jacques Monod introduced the operon model to explain gene regulation, specifically the lac operon. Alec Jeffreys developed the DNA fingerprinting technique. Matthew Meselson and Franklin Stahl demonstrated the semi-conservative mechanism of DNA replication in E. coli. Alfred Hershey and Martha Chase established that DNA, not protein, is the genetic material.

1. (a)
2. (b)
3. (c)
4. (d)

Correct answer: (c)

Solution

The question directly states that Francois Jacob and Jacque Monod proposed the operon model/lac operon, which matches option (c). The other scientists' contributions are also correctly described but unrelated to the lac operon.

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