Medical
Biology
DNA
Question

The promoter site and the terminator site for transcription are located at

3 (downstream) end and 5 (upstream) end, respectively of the transcription unit

5 (upstream) end and 3 (downstream) end, respectively of the transcription unit

the 5 (upstream) end

the 3 (downstream) end.

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Solution
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The promoter sequence needs to lie in front of the start site or upstream to it in the 5' end and the terminator should lie in the 3' end downstream as transcription proceeds in the 5' to 3' direction.

So, the correct answer is, '5 (upstream) end and 3 (downstream) end, respectively of the transcription unit'.
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