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What is transcription? What are the different parts of a DNA transcription unit? What is their role in the process of transcription?



Transcription: Formation of RNA over DNA template is called transcription. Both the strands of DNA do not transcribe RNA, but only one of them does it. Transcription requires enzyme RNA polymerase. All the three species of RNA are produced through transcription.
The segment of DNA that takes part in transcription is called transcription unit. It has three components, (i) a promotor, (ii) the structural gene and (iii) a terminator. Promotor starts the transcription, structural gene code for the synthesis of specific polypeptides and terminator stops the transcription.

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