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Which of the following is the most appropriate definition of an operator?

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Which of the following is the most appropriate definition of an operator?

(a) A non-coding, regulatory DNA sequence that is bound by RNA polymerase

(b) A non-coding, regulatory DNA sequence that is bound by a repressor protein

(c) A DNA-binding protein that regulates gene expression

(d) A cluster of genes that are regulated by a single promoter

The question was posed to me during an interview.

The query is from Regulation of Gene Expression in Prokaryotes-1 in portion Regulation of Gene Expression and Miscellaneous of Biochemistry

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Best answer
Correct choice is (b) A non-coding, regulatory DNA sequence that is bound by a repressor protein

Easy explanation: A repressor binds to the operator.

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