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OJEE Transcription — practice questions

Explore 2 free Transcription questions in OJEE Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Transcription questions and exercises with answers

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During **transcription** in eukaryotes, m-RNA is transcribed by:Read the answer and worked solution →In the structural gene of a transcription unit, the **template strand** has polarity:Read the answer and worked solution →

Worked practice questions

During **transcription** in eukaryotes, m-RNA is transcribed by:

  1. RNA polymerase I
  2. RNA polymerase II
  3. RNA polymerase III
  4. DNA polymerase α
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Correct answer: B. RNA polymerase II

RNA polymerase I → rRNA RNA polymerase II → mRNA (and hnRNA, the primary transcript) RNA polymerase III → tRNA and snRNA. Prokaryotes have only one RNA polymerase that does all three.

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In the structural gene of a transcription unit, the **template strand** has polarity:

  1. 5'→3'
  2. 3'→5'
  3. Either, randomly
  4. Both 5' and 3' simultaneously
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Correct answer: B. 3'→5'

The template (antisense) strand runs 3'→5' (so that RNA polymerase, which synthesises mRNA 5'→3', can read it). The other DNA strand (coding/sense strand, 5'→3') has the same sequence as the mRNA (T replaced by U).

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