Molecular Basis of InheritanceMedium

Question

Which of the following statements are correct with reference to a transcription unit?

A. A transcription unit in DNA is defined primarily by three regions : promoter, structural gene and terminator.

A. The promoter is said to be located towards the 5'-end of the structural gene.

B. The promoter is a DNA sequence that provides binding site for RNA polymerase.

C. The promoter defines the template and coding strands.

D. The terminator is located towards the 3'-end of the coding strand and it defines the end of the process of transcription.

Choose the correct answer from the options given below:

Options

A.A, B, C and D only
B.A, C, D and E only
C.B, C, D and E only
D.A, B, C , D and E

Solution

Sol. [Key Concept: Transcription unit — promoter, structural gene, terminator]

The promoter and terminator flank the structural gene in a transcription unit.

The promoter is said to be located towards 5'-end of the structural gene.

It is a DNA sequence that provides binding site for RNA polymerase and it is the presence of promoter in a transcription unit that also defines the template and coding strands.

The terminator is located towards 3'-end of the coding strand and it usually defines the end of transcription.

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