Molecular Basis of InheritanceMedium
Question
A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and downstream end;
Options
A.Inducer, Repressor, Structural gene
B.Promoter, Structural gene, Terminator
C.Repressor, Operator gene, Structural gene
D.Structural gene, Transposons, Operator gene
Solution
Sol. [Key Concept: Regions of a transcription unit]
A transcription unit comprises a promoter, a structural gene and a terminator, in that order. Relative to the coding strand, the promoter lies upstream towards the 5′ end and the terminator lies downstream towards the 3′ end. Hence, option (2).
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