RNA Types · Botany

What is the function of the 7-methylguanosine cap found on eukaryotic mRNA?

  1. To signal the termination of RNA polymerase II transcription
  2. To assist in ribosome binding and protect from exonucleases
  3. To code for the first amino acid in the polypeptide chain
  4. To facilitate the splicing of all introns from pre-mRNA
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Correct answer: To assist in ribosome binding and protect from exonucleases

The 5' cap is added shortly after transcription begins. It is vital for the recognition of mRNA by the translation initiation factors and prevents the transcript from being degraded.

Difficulty: Medium Question 11 of 20

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