And what that means is we have the DNA molecule that that is used to store the genetic information that is basically transcribed into the RNA molecule and then it's the RNA molecule that is ultimately used to synthesize the many different types of proteins that are used by that cell and needed by that cell to survive. Now, in human cells, we have linear molecules of DNA and what that means is we have a beginning and we have an end. But in other organisms, for example, bacterial cells, they have circular DNA molecules. And what that means is they don't have a beginning, they don't have an end, they are continuous, as we see in the following circle. Now, linear DNA molecules and circular DNA molecules are actually relatively large and relatively long. And if we zoom in into the cell of either bacterial cells or our own human cells, we're not going to see these DNA molecules existing in the following form.