The nucleoid region does not have a membrane like our nucleus does inside the eukaryotic cell. So usually inside a prokaryotic cell, we basically have a single double stranded circular DNA that is shown in brown. It basically contains our genes that code for the proteins that exist and function within our prokaryotic cell. Now, notice within this region, we not only have this large DNA, we also have a small DNA. And the small DNA is known as the plasma. And the plasma usually contains several types of important genes.