NEET · BiologyMedium
In the lac operon, the repressor protein binds to which of the following sites to inhibit transcription?
- A.Promoter
- B.Operator
- C.Structural gene
- D.Regulator gene
Show correct answer & step-by-step solution
Correct answer: B — Operator
Solution
- The lac operon consists of a promoter, operator, and structural genes.
- The regulator gene produces a repressor protein.
- In the absence of an inducer, the repressor binds to the operator.
- Binding to the operator prevents RNA polymerase from moving along the DNA.
- Hence the answer is (B).
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