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Retrovirus is a type of RNA virus that inserts a copy of its genome into the DNA of a host cell that it invades, thus changing the genome of that cell. Retrovirus is commonly used as vector for introducing a DNA fragment in human lymphocyte.

1. Retrovirus is a DNA virus.
2. Retrovirus is an RNA virus.
3. Retrovirus is used as a vector for introducing DNA fragments.
4. Retrovirus is used as a vector for introducing RNA fragments.

Correct answer: Retrovirus is used as a vector for introducing DNA fragments.

Solution

Retroviruses are RNA viruses that reverse-transcribe their genome and integrate a DNA copy into the host chromosome. That integration ability is why they are commonly used as vectors to introduce DNA fragments into human lymphocytes.

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