Now in prokaryotic cells there are three types of rRNA molecules found in the ribosome. We have the 23s, we have the we have the five S. Now in addition to these three major components of the RNA molecules found inside our body we have these additional RNA molecules that also serve their own unique function and purpose. Let's discuss what some of these RNA molecules are and let's begin with small nuclear RNA or SN RNA. 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.