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NEETZoologyMolecular Basis of Inheritance

In a transcription unit, the DNA strand that has the promoter located at its 5' end has the following sequence: 5' CGATCGAT 3' What will be the sequence of the mRNA transcribed from this transcription unit?

Options

  1. A3' GCUAGCUA 5'
  2. B5' GCUAGCUA 3'
  3. C5' CGAUCGAU 3'
  4. D3' CGAUCGAU 5'

Correct answer

C. 5' CGAUCGAU 3'

Step-by-step solution

In a transcription unit, the promoter is located towards the 5' end (upstream) of the structural gene, and this reference is made with respect to the polarity of the coding strand. Therefore, the DNA strand with the promoter at its 5' end is the coding strand. The coding strand has the sequence 5' CGATCGAT 3'. The mRNA transcribed from a transcription unit has the exact same sequence and polarity as the coding strand, with the only difference being the presence of Uracil (U) in RNA instead of Thymine (T) in DNA. Re

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