What is the role of the 5' cap and poly-A tail in eukaryotic mRNA?

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They regulate alternative splicing of the mRNA molecule

They protect the mRNA molecule from degradation by exonucleases

They signal the termination of translation

They facilitate the binding of ribosomes during translation initiation

Answer: They protect the mRNA molecule from degradation by exonucleases

Explanation:

The 5' cap and poly-A tail help stabilize eukaryotic mRNA molecules and protect them from degradation by exonucleases in the cytoplasm.