Before termination stage of transcription a GMP cap is added to the 5' end and poly-A tail to 3' end of mRNA.

The link(http://sciencing.com/role-rna-polyadenylation-5434666.html) says:

The poly(A) chain is important for transport of the mRNA from the nucleus where it is synthesized to the ribosomes where protein is translated.

I don't get this point. How does polyadenylation affcts the transportation of mRNA?

Wikipedia says abour capping's functions:

Regulation of nuclear export; Prevention of degradation by exonucleases; Promotion of translation (see ribosome and translation); Promotion of 5′ proximal intron excision.

I don't get how it plays a role in nuclear export.

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    $\begingroup$ What research have you done before asking it here? $\endgroup$ – another 'Homo sapien' Mar 3 '17 at 14:50
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    $\begingroup$ Actually I read the importance of this activity but didn't understand some keypoints. I will edit it now. $\endgroup$ – Mockingbird Mar 3 '17 at 15:25
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    $\begingroup$ @Mockingbird I really like this as a resource, I think you can start at the subheading Key steps in mRNA processing: jcs.biologists.org/content/joces/122/12/1933.full.pdf $\endgroup$ – CKM Mar 3 '17 at 16:19

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