" The poly A tail is like a time control for the mRNA. mRNA is pretty unstable and degrades rapidly in the cell. The 5' cap and poly A tail help the mRNA's longevity. The longer the tail, usually, the longer the mRNA hangs around and translates more proteins before it is degraded."
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database