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B
Retrovirus
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C
Tonga virus
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D
All of these
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Solution
The correct option is B Retrovirus The virus that has reserve transcriptase enzyme is the retrovirus. It has a single stranded RNA with a protein coating. After entry into the host cell, the single stranded RNA is changed into double-stranded DNA by a virally encoded reverse transcriptase. With the help of integrase, the viral DNA gets incorporated into the cellular DNA and starts replicating. For example, HIV virus.