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

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

COMEDKCOMEDK 2014Molecular Basis of Inheritance

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.