And this complexity, this ability of the RNA molecule to form this complex structure gives it the ability to function in many different ways. And this means just like proteins can function biological catalysts RNA molecules can also act as biological catalysts as we'll see, for example when we discuss the process of protein synthesis. So in protein synthesis we have these cellular machinery structures known as ribosomes and ribosomes contain RNA molecules and these RNA molecules act as biological catalysts to basically synthesize that protein chain. And we'll discuss that in much more detail in a future lecture. Now, the final thing that I like to mention is the tRNA molecule or the transfer RNA molecule as we'll see in a future lecture there are many types of RNA molecules that exist inside our cells and these RNA molecules can basically act in certain specific ways. One of these RNA molecules is the tRNA molecule and this is the shape that the tRNA molecule actually takes.