The function of promoter in lac operon is to

Bind to gyrase

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Bind to RNA polymerase

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Code for DNA polymerse

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Process mRNA

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Solution

The correct option is B Bind to RNA polymerase
DNA gyrase is topoisomerase II that can introduce negative supercoils using the energy of ATP. It cleaves both strands of a DNA molecule and passes another duplex through the break. Processing of mRNA includes splicing, capping and tailing. It is a process specific to eukaryotic primary transcripts and is not found in E. coli which make option D wrong. Prokaryotic DNA polymerase is a single-polypeptide enzyme and is encoded by the polA gene. The promoter is a DNA segment that serves to initiate transcription of a gene by providing the binding site for RNA polymerase. They are present upstream near the transcription start sites of genes.
Thus, the correct answer is option B.

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