Topic: DNA as genetic material, DNA and RNA structure, DNA packaging· Genetics and Evolution

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1. Alec Jeffreys – *Streptococcus pneumoniae*

2. Matthew Meselson and F. Stahl – *Pisum sativum*

3. Alfred Hershey and Martha Chase – TMV

4. Francois Jacob and Jacques Monod – *Lac* operon

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Answer: 4. Francois Jacob and Jacques Monod – *Lac* operon

Jacob and Monod proposed the lac operon model of gene regulation in E. coli.

Jeffreys worked on DNA fingerprinting, not Streptococcus (Griffith). Meselson and Stahl used E. coli, not pea. Hershey and Chase used bacteriophage, not TMV.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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