What happens in RNA processing? cap and tail?

- Enzymes in the eukaryotic nucleus modify pre-mRNA (RNA processing) before the genetic messages are dispatched to the cytoplasm​ - During RNA processing, both ends of the primary transcript are altered​ - Also, in most cases, certain interior sections of the molecule are cut out and the remaining parts spliced together​ - Each end of a pre-mRNA molecule is modified in a particular way​ (The 5′ end receives a modified nucleotide 5′ cap​, The 3′ end gets a poly-A tail​) - Functions of these modifications: They seem to facilitate the export of mRNA to the cytoplasm, They protect mRNA from hydrolytic enzymes​, They help ribosomes attach to the 5′ end​