Which process adds a poly(A) tail to mRNA?

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Multiple Choice

Which process adds a poly(A) tail to mRNA?

Explanation:
Polyadenylation is the step that adds a poly(A) tail to mRNA. After transcription, the pre-mRNA is cleaved at a specific site and a string of adenines is added by poly(A) polymerase. This tail stabilizes the transcript, helps export it from the nucleus, and enhances translation efficiency by aiding ribosome recruitment. Splicing removes introns, capping attaches the 5' cap, and transcription initiation starts RNA synthesis, so those processes do not add the poly(A) tail.

Polyadenylation is the step that adds a poly(A) tail to mRNA. After transcription, the pre-mRNA is cleaved at a specific site and a string of adenines is added by poly(A) polymerase. This tail stabilizes the transcript, helps export it from the nucleus, and enhances translation efficiency by aiding ribosome recruitment. Splicing removes introns, capping attaches the 5' cap, and transcription initiation starts RNA synthesis, so those processes do not add the poly(A) tail.

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