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Q.
During expression of an operon, $RNA$ polymerase binds to
Molecular Basis of Inheritance
Solution:
Promoter gene acts as an initiation signal which functions as recognition centre for $RNA$ polymerase 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.