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Which polycistronic structural gene is regulated by a common promoter and regulatory gene?

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in Biology – Class 12 by (271k points)
Which polycistronic structural gene is regulated by a common promoter and regulatory gene?

(a) Trp operon

(b) Lac operon

(c) Ara operon

(d) His operon

I 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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