Now earlier when I discussed the messenger RNA molecule I said that in eukaryotic cells we actually have to first modify the pre mRNA molecule before it becomes a fully mature and fully functional mRNA molecule. And one way by which we modify it is by removing the introns and splicing together gluing together the axons. Now what the function of small nuclear RNA is is to basically splice together the exons to form that fully mature mRNA that can then be used by the ribosomes to basically synthesize that given polypeptide chain. Now let's move on to microRNA or miRNA. Now the reason we call this microRNA is because it's actually a very tiny RNA molecule. It only consists of about 20 nucleotides and what it does is essentially binds onto the complementary mRNA molecule and it prevents it inhibits the process of translation so the synthesis of the polypeptide chain.