Q.
The promoter site and the terminator site for transcription are located at
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Molecular Basis of Inheritance
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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'.