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Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?

1. Retrovirus
2. Ti plasmid
3. pBR 322
4. λ phage

Correct answer: Retrovirus

Solution

Retroviruses are commonly used to deliver DNA into human lymphocytes because they infect mammalian cells and can integrate the introduced gene into the host genome. Ti plasmid is a plant vector, pBR322 is a bacterial plasmid, and λ phage is a bacteriophage vector for bacteria.

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