Q150 / 200 · NEET 2024 · Zoology

A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and down stream end;

  • A
    Structural gene, Transposons, Operator gene
  • B
    Inducer, Repressor, Structural gene
  • Correct answer
    C
    Promotor, Structural gene, Terminator
  • D
    Repressor, Operator gene, Structural gene

Solution

A transcription unit of DNA is defined primarily by the three regions in the DNA: (i) A promoter (ii) The structural gene (iii) A terminator The promoter is said to be located towards 5 '-end (upstream) of the structural gene (the reference is made with respect to the polarity of coding strand) The terminator is located towards 3 '-end (downstream) of the coding strand.

Hence, the correct answer is option: 'C'.

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