Q42 / 200 · MHT CET - Medical 2026 (22 April Shift 1) · Biology
A promoter in a transcription unit is a DNA sequence ________.
- Awhich appears in processed RNA
- Correct answerBthat provides a binding site for RNA polymerase
- Cwhich terminates the transcription process
- Dthat provides the binding site for DNA polymerase
Solution
A promoter is a specific DNA sequence in a transcription unit that provides a binding site for RNA polymerase and transcription factors to initiate the process of transcription.
It is located towards the $5'$ end (upstream) of the structural gene with respect to the coding strand.
The promoter itself is not transcribed into RNA, nor does it terminate transcription (which is the function of the terminator sequence). DNA polymerase binds to origins of replication during DNA replication, not to promoters during transcription.
Answer: that provides a binding site for RNA polymerase
It is located towards the $5'$ end (upstream) of the structural gene with respect to the coding strand.
The promoter itself is not transcribed into RNA, nor does it terminate transcription (which is the function of the terminator sequence). DNA polymerase binds to origins of replication during DNA replication, not to promoters during transcription.
Answer: that provides a binding site for RNA polymerase
Hence, the correct answer is option: 'B'.