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nmdcat.online June 27, 2026

The function of the 5′ cap and 3′ poly-A tail added to eukaryotic mRNA is to

A. Serve as the start and stop signals for translation of the coding sequence
B. Facilitate the splicing of exons and the removal of introns
C. Protect the mRNA molecule from exonucleolytic degradation in the cytoplasm
✓
D. Provide the template for the synthesis of the protein's primary sequence

📝 Explanation

The 5' cap and the 3' poly-A tail are not translated. Their primary roles are to increase the stability of the mRNA by protecting its ends from ribonucleases, and to facilitate the initiation of translation by interacting with translation initiation factors.

📖 Additional Information

  • Serve as the start and stop signals for translation of the coding sequence
  • Facilitate the splicing of exons and the removal of introns
  • Protect the mRNA molecule from exonucleolytic degradation in the cytoplasm
  • Provide the template for the synthesis of the protein's primary sequence

The 5' cap and the 3' poly-A tail are not translated. Their primary roles are to increase the stability of the mRNA by protecting its ends from ribonucleases, and to facilitate the initiation of translation by interacting with translation initiation factors.

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