Now the question is why can't we use our DNA molecule to directly synthesize our proteins? Why do we have to use these intermediate RNA molecules? Well, the answer is pretty simple. So the advantage of using RNA in that cell is to basically make sure that we do not damage or hurt our DNA in any way. So we want to ensure that the DNA is not mutated because the DNA is essential for the survival of the cell as well as of the offspring. So during reproduction it's the DNA that is passed down and not the RNA.