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Which polycistronic structural gene is regulated by a common promoter and regulatory gene?(a) Trp operon(b) Lac operon(c) Ara operon(d) His operonI had been asked this question in an internship interview.This intriguing question originated from Molecular Basis of Inheritance in chapter Molecular Basis of Inheritance of Biology – Class 12

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The correct answer is (B) Lac operon

The BEST I can explain: Lac (lactose) operon has a polycistronic STRUCTURAL gene which is regulated by a common promoter and regulatory gene. It is MAINLY present in prokaryotes like bacteria. This TYPE of an arrangement is called as an operon in general.



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