A) Double-stranded RNA
B) Single-stranded RNA
Correct Answer: B
Solution :All viruses are nucleoprotein (Nucleic acid + Protein) in the structure. The nucleic acid (DNA and RNA) is genetic material. In a particular virus, either DNA or RNA is the genetic material and both are never present in a virus. Viruses are known as the bases of genetic material as DNA viruses or RNA viruses. Hence, the type of viruses are: (i) Double stranded DNA or dsDNA - Hepatitis B (ii) Single stranded DNA or ssDNA - coliphage (iii) Double stranded RNA or dsRNA Reo virus, wound tumour virus (iv) Single stranded RNA or ssRNA - Tobacco mosaic virus (TMV) Hence, the correct option is (b).
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