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Which of the following is present in E. coli rrnB operon for rRNA?

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Which of the following is present in E. coli rrnB operon for rRNA?

(a) Initiation codon

(b) Termination codon

(c) Both initiation and termination codon

(d) Both are absent

I had been asked this question in an interview for job.

Enquiry is from Expression in Vivo topic in section Use of Cloned DNA of Genetic Engineering

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Correct answer is (c) Both initiation and termination codon

To explain: Initiation codon is present in all expression vectors, but few are also having termination codons. It is necessary to stop high levels of transcription.

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