Transcription and Translation · USMLE Step 1

Which of the following statements is TRUE about eukaryotic pre-mRNA but FALSE for prokaryotic mRNA?

  1. It can be immediately translated upon synthesis
  2. It contains introns and undergoes splicing
  3. It is polycistronic
  4. It is synthesized by a holoenzyme with sigma factor
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Correct answer: It contains introns and undergoes splicing

Eukaryotic pre-mRNA includes introns which are removed via splicing; prokaryotic mRNA generally lacks introns and does not undergo splicing.

Difficulty: Medium Question 7 of 22

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