NEET 2018 · BiologyPrevious Year Question
Select the correct match. a. Matthew Meselson and F. Stahl - Pisum sativum b. Alfred Hershey and Martha Chase - TMV c. Alec Jeffreys - Streptococcus pneumoniae d. Francois Jacob and Jacques Monod - Lac operon
Answer: (D) Francois Jacob and Jacques Monod - Lac operon. Answer: (D) Francois Jacob and Jacques Monod - Lac operon.
- A.Matthew Meselson and F. Stahl - Pisum sativum
- B.Alfred Hershey and Martha Chase - TMV
- C.Alec Jeffreys - Streptococcus pneumoniae
- D.Francois Jacob and Jacques Monod - Lac operon✓
Correct Answer
(D) Francois Jacob and Jacques Monod - Lac operon
Solution & Explanation
Answer: (D) Francois Jacob and Jacques Monod - Lac operon. Jacob and Monod elucidated the lac operon, the first transcriptionally regulated system; the other three pairings are wrong (Meselson-Stahl used E. coli for semiconservative replication, Hershey-Chase used bacteriophages, and Alec Jeffreys developed DNA fingerprinting). NCERT Ch 5, p.100, lines 27-29: "The elucidation of the lac operon was also a result of a close association between a geneticist, Francois Jacob and a biochemist, Jacque Monod."
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