The accessibility of promoter regions of bacterial DNA in many cases regulated by the interaction of proteins with sequences termed

Regulators

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Structural genes

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Inhibitor genes

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Operators

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Solution

The correct option is D Operators
The accessibility of promoter regions of prokaryotic DNA is in many cases regulated by the interaction of proteins with sequences termed operators. The operator region is adjacent to the promoter elements in most operons and in most cases the sequences of the operator bind a repressor protein.
So, the correct answer is 'Operators'.

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