Transcription Unit Components — NEET Biology
✅ Asked in NEET 2026A transcription unit in DNA is defined primarily by the three regions in the DNA: (i) A Promoter (ii) The Structural gene (iii) A Terminator
A transcription unit consists of three essential parts: the promoter (where RNA polymerase binds), the structural gene (coding sequence), and the terminator (where transcription stops). NTA tests whether students can identify and distinguish these three regions and understand their functions. Common mistakes include confusing the promoter with the operator, thinking the entire chromosome is transcribed, or misunderstanding that the terminator is a DNA sequence, not a protein. Remember: the promoter is non-coding but essential for initiation, the structural gene gets transcribed into mRNA, and the terminator signals transcription cessation. This concept appears repeatedly in NEET because it's foundational to understanding gene expression.
This paragraph was tested 3 times in NEET.
Which statements are correct about a transcription unit? A. Defined by promoter, structural gene and terminator. B. Promoter is towards 5' end of structural gene. C. Promoter is binding site for RNA polymerase. D. Promoter defines template and coding strands. E. Terminator is at 3' end of coding strand and ends transcription.
A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and downstream end:
All of the following are parts of an operon, except: (NEET 2018)
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