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.
B. The promoter is said to be located towards the 5′-end of the structural gene.
C. The promoter is a DNA sequence that provides binding site for RNA polymerase.
D. The promoter defines the template and coding strands.
E. 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:
- 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
A transcription unit consists of a promoter, a structural gene and a terminator, with the promoter and terminator flanking the structural gene.
The promoter lies towards the 5′-end of the structural gene and provides the binding site for RNA polymerase. Its location also identifies which strand serves as template and which serves as coding strand.
The terminator lies towards the 3′-end of the coding strand and marks the end of transcription. Hence all five statements are correct.
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