Polyadenylation serves which primary roles for mRNA?

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Multiple Choice

Polyadenylation serves which primary roles for mRNA?

Explanation:
Polyadenylation places a tail on the 3' end of mRNA, and its main effects are to keep the message stable and to help it exit the nucleus. The poly(A) tail protects the RNA from exonuclease attack and, through binding by poly(A)-binding proteins, supports efficient export to the cytoplasm. In the cytoplasm, these proteins also help recruit translation machinery, promoting effective translation, often by helping the mRNA form a circle with the 5' end that enhances ribosome reuse. It does not create a stop codon—that’s part of the coding sequence; it does not form the 5' cap—that cap is added at the 5' end early in transcription; and it does not recruit tRNA synthetases, which are enzymes involved in charging tRNAs for translation.

Polyadenylation places a tail on the 3' end of mRNA, and its main effects are to keep the message stable and to help it exit the nucleus. The poly(A) tail protects the RNA from exonuclease attack and, through binding by poly(A)-binding proteins, supports efficient export to the cytoplasm. In the cytoplasm, these proteins also help recruit translation machinery, promoting effective translation, often by helping the mRNA form a circle with the 5' end that enhances ribosome reuse. It does not create a stop codon—that’s part of the coding sequence; it does not form the 5' cap—that cap is added at the 5' end early in transcription; and it does not recruit tRNA synthetases, which are enzymes involved in charging tRNAs for translation.

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