Now, what these viruses basically do is because they cannot reproduce on their own accord what they do is they move from one host cell to a different whole cell. They infect these cells by injecting their genetic information and then once inside the cell they use the machinery of the cell to basically reproduce and form other viral agents. For example, if we look at the tobacco mosaic virus the tobacco mosaic virus is actually the first virus that we discovered and this tobacco mosaic virus consists of this protein capsite a helical protein capsite that consists of 2130 identical polypeptide subunits and these subunits form this helical protein capsule. And inside that capsule we have a single stranded RNA molecule and it is given by 6390 nucleotides in length. So this is the length of that particular RNA molecule inside this virus. Now, once the tobacco mosaic virus actually infects that whole cell it injects the RNA molecule into that whole cell.