In an operon what is present in between the promoter and structural genes?

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Solution

An operon is a cluster of functionally-related genes that are controlled by a shared operator. Operons consist of structural genes grouped together with a common promoter and an operator.
There are three basic components to an Operon
Promoter – Upstream sequence to which RNA polymerase binds
Operator – Segment of DNA to which a repressor protein binds (inhibits transcription by obstructing RNA polymerase)
Structural genes – Genes that are collectively regulated by the Operon
So, it is operator that is present between the promoters and structural genes.

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