Which of the following represents the correct sequence of genes of a lac operon system?

Promoter gene, repressor, structural genes

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Repressor, structural genes, operator gene

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Promoter gene, operator gene, structural genes

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Structural genes, promoter gene, operator gene

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Solution

The correct option is C Promoter gene, operator gene, structural genes
The lac operon of E.coli consists of a promoter gene, operator gene and three structural genes, all of which work together to digest lactose. There is also a regulator gene which is usually present outside the operon, but is essential, as it codes for the repressor protein.

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