Final answer:
RNA splicing and polyadenylation are two posttranscriptional modifications that take place in the mRNA of eukaryotes. RNA splicing involves removing introns and ligating exons together, while polyadenylation adds a poly-A tail to the mRNA. These modifications protect the mRNA and facilitate its export from the nucleus.
Step-by-step explanation:
RNA splicing and polyadenylation are two types of posttranscriptional modifications that take place in the mRNA of eukaryotes. After RNA is transcribed, it is often modified to create a mature RNA that is ready to be translated. RNA splicing involves removing the introns that do not code for protein and ligating the exons together in different sequences. Polyadenylation involves adding a poly-A tail to the 3'-end of the mRNA. These modifications protect the mRNA and help in its export from the nucleus.