A transcription unit in DNA is defined primarily by:

UTR + TR region

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A promoter, structural gene and terminator

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Only promotor and terminator

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Only terminator

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Solution

The correct option is B A promoter, structural gene and terminator
A transcription unit is a segment of DNA that takes part in transcription. It has three components - (i) a promoter (ii) a structural gene and (iii) a terminator. Promoter is located upstream of structural gene. Terminator region is present downstream.

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