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Question

The single stranded DNA is found in

A
TMV
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B
ϕ× 174
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C
Polio virus
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D
Smallpox virus
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Solution

The correct option is B ϕ× 174
With respect to nucleic acids present, three types of viruses have been recognised. DNA viruses, RNA viruses and DNA-RNA viruses.
Single stranded DNA is found in the bacteriophages like ϕ x 174 and M-13. The single stranded DNA in these viruses is a cyclic molecule.
So, the correct answer is option B.

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