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. Now, what about Small RNA? Well small RNA is basically a constituent of this biological molecule found in a cytoplasm of our cells known as the signal recognition particle. Now remember from biology the signal recognition particle is this complex that binds onto the protein that synthesize polypeptide chain and then brings it to its final destination be it in the cell or outside of cell.