A.Produces mRNA
B. Produces repressor molecules
C. Identifies the substrate molecule (lactose)
D. Permits transcription
E. None of these represents the correct function.
What is the function of the operator locus of an operon?
An operator is a segment of DNA which regulates the activity of the structural genes of the operon that it is linked to, by interacting with a specific repressor or activator. It is a regulatory sequence for shutting a gene down or turning it "on".
So I'd say D is the best choice from the given options.
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