Question

Circular double stranded DNA is found in virus

• A. TMV
• B. $\varphi$ x 174
• C. SV 40
• D. All of the above

Answer 1

The correct option is C SV 40

Three types of viruses have been recognised DNA virus, RNA virus and DNA-RNA virus. With respect to the number of strands, four types of nucleic acids have been found in viruses double stranded DNA, single stranded DNA, double stranded RNA and single stranded RNA. Double stranded DNA has been found in Pox viruses, the coliphages T2, T4, T6, T3, T7 and lambda, herpes virus, adeno virus, polyoma virus, SV-40 and papilloma viruses etc. SV40 is an abbreviation for simian vacuolating virus 40 or simian virus 40, a polyomavirus that is found in both monkeys and humans. Like other polyomaviruses, SV40 is a DNA virus that has the potential to cause tumors, but most often persists as a latent infection.