Tobacco Mosaic Virus (TMV) genes are

Step-by-step solution

All viruses are nucleoprotein (Nucleic acid + Protein) in the structure. The nucleic acid (DNA and RNA) is the genetic material. In a particular virus, either DNA or RNA is genetic material; never both are present in a virus. Hence viruses are: (i) Double-stranded DNA or ds DNA - Hepatitis B (ii) Single-stranded DNA or ss DNA - Coliphage (iii) Double-stranded RNA or ds RNA - Reovirus, wound Tumor virus (iv) Single-stranded RNA or ss RNA - Tobacco mosaic virus (TMV)