The promoter site and the terminator site for transcription are located at:
a. 3′ (downstream) end and 5′ (upstream) end, respectively of the transcription unit
b. 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit
c. the 5′ (upstream) end
d. the 3′ (downstream) end
The answer is the option (b) 5' (upstream) end and 3' (downstream) end, respectively, of the transcription unit.