During expression of an operon, RNA polymerase binds to

structural gene

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regulator gene

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operator

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promoter

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Solution

The correct option is D promoter
Promoter gene acts as an initiation signal which functions as recognition center for RNA polyrmerase provided the operator gene is switched on. RNA polymerase is bound to the promoter gene. When the operator gene is functional, the polymerase moves over it and reaches the structural genes to perform transcription.

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In the operon model, RNA polymerase binds to___ .

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