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Q.

Correct statement with reference to transcription unit.
I. Promoter and terminator flank the structural gene.
II. The promoter is said to be located towards 5'-end (upstream) of the structural gene (the reference is made with respect to the polarity of coding strand).
III. The terminator is located towards 3'-end (downstream) of the coding strand.
IV. There are additional regulatory sequences that may be present further upstream or downstream to the promoter.

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a

I & II only

b

II & III only

c

I, II & IV only

d

I, II, III & IV

answer is D.

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Detailed Solution

I, II, III & IV

The promoter and terminator flank the structural gene in a transcription unit. The promoter is said to be located towards 5'-end (upstream) of the structural gene, the terminator is located towards 3'-end
(downstream) of the coding strand.

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Correct statement with reference to transcription unit.I. Promoter and terminator flank the structural gene.II. The promoter is said to be located towards 5'-end (upstream) of the structural gene (the reference is made with respect to the polarity of coding strand).III. The terminator is located towards 3'-end (downstream) of the coding strand.IV. There are additional regulatory sequences that may be present further upstream or downstream to the promoter.