Q. A 'transcription unit' in DNA is defined primarily by the
(i) promoter
(ii) structural genes
(iii) Okazaki fragments
(iv) adenylate residues
(v) terminator

 3938  195 COMEDKCOMEDK 2014Molecular Basis of Inheritance Report Error

Solution:

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. Besides a promoter, eukaryotes also · require an enhancer. Promoter is located upstream of structural gene (at 5' end of coding strand). Terminator region is present downstream at ·3 end. Transcription factors attach at promoter region.