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Solution


Q.

A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and downstream end.          [2024]
1 repressor, operator gene, structural gene  
2 structural gene, transposons, operator gene  
3 inducer, repressor, structural gene  
4 promotor, structural gene, terminator  

Ans.

(4)

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