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When was the operation mechanism of a bacterial operon first elucidated?

(a) 1961

(b) 1971

(c) 1981

(d) 1991

I had been asked this question during an interview for a job.

My question is taken from Gene Expression Control in portion Control of Gene Expression of Cell Biology

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The correct option is (a) 1961

The explanation: The mechanism by which all the genes of an operon operate, was first elucidated in 1961 by Francois Jacob and Jacques Monod of the Pasteur Institute in Paris. An operon consists of structural genes, a promoter region, an operator region and a regulator gene.

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