And what reverse transcriptase basically does is once the RNA is inside the cytoplasm of the cell the reverse transcriptase basically transcribes our RNA into DNA which is in the opposite direction of normal transcription. And then once that viral DNA is synthesized it can go into the nucleus of that cell and in the nucleus of the cell it can be incorporated or integrated with the cell's own DNA genome. Now when the cell replicates its DNA and divides it passes down the viral DNA portion to the offspring cells. And one common example of an RNA virus known as the retrovirus that in fact humans is known as HIV or human immunodeficiency virus. Now the next type of category within RNA viruses that we're going to discuss are plus strand RNA and minus strand RNA also known as positive strand RNA and negative strand RNA viruses. Now what exactly is the plus strand or the positive strand RNA virus?