Final answer:
In eukaryotes, pre-mRNA processing includes the addition of a 5' cap, splicing, editing, and 3' polyadenylation.
Step-by-step explanation:
In eukaryotes, the mRNA undergoes several processing steps before it can be translated. These steps include the addition of a 5' cap, splicing, editing, and 3' polyadenylation. The 5' cap is added to the 5' end of the mRNA and helps initiate translation by ribosomes. Splicing removes noncoding introns from the mRNA. Editing can insert missing bases into the mRNA. And 3' polyadenylation adds a poly-A tail, which protects the mRNA from degradation and signals its export from the nucleus.