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BIO NMDCAT Ribonucleic acid (RNA)
nmdcat.online July 3, 2026

25. The presence of a poly-A tail at the 3′ end of a eukaryotic mRNA molecule functions to

A. Direct the ribosome to the start codon
B. Promote splicing of the final intron
C. Enhance stability and resist cytoplasmic degradation
✓
D. Initiate transcription termination

📝 Explanation

The poly-A tail protects mRNA from 3' exonucleases, extending its operational lifespan within the cytoplasm.

📖 Additional Information

  • Direct the ribosome to the start codon
  • Promote splicing of the final intron
  • Enhance stability and resist cytoplasmic degradation
  • Initiate transcription termination

The poly-A tail protects mRNA from 3' exonucleases, extending its operational lifespan within the cytoplasm.

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