> The very end of mRNA is polyadenylated. This is a fancy way of saying it ends on a lot of AAAAAAAAAAAAAAAAAAA. Even mRNA has had enough of 2020 it appears.

> mRNA can be reused many times, but as this happens, it also loses some of the A’s at the end. Once the A’s run out, the mRNA is no longer functional and gets discarded. In this way, the ‘poly-A’ tail is protection from degradation.

Also, your cells continuously make mRNAs, depending on what proteins they need to synthesize. And those (have to) get discarded too. And also this is what happens to the actual viral RNA when the virus attacks you for real.