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

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

Molecular Basis of Inheritance

Solution:

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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