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Which of the following statements about lac operon in e.coli is true?

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Which of the following statements about lac operon in e.coli is true?

(a) Promoter is the binding site for the lac repressor

(b) Operon is only switched on in the absence of lactose in the growth medium

(c) β-galactosidase is only produced in large quantities when the lac repressor is bound to the operator

(d) Lac operon mRNA is a polycistronic mRNA

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This intriguing question originated from Regulation of Gene Expression in Prokaryotes-1 topic in division Regulation of Gene Expression and Miscellaneous of Biochemistry

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The correct choice is (d) Lac operon mRNA is a polycistronic mRNA

Easiest explanation: Bacterial genes are polycistronic and genes in eukaryotes are monocistronic.

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