A) Baculovirus
B) Salmonella typhimurium
C) Rhizopus nigricans
D) Retrovirus
Correct Answer: D
Solution :
Retroviruses are RNA containing animal viruses that replicate through a DNA intermediate. Retroviruses in animals have the ability to transform normal cells into cancerous cells. A better understanding of the act of delivering genes by pathogen in these eukaryotic hosts has generated knowledge to transform these tools of pathogen into useful vectors-for delivering genes of interest of humans. Retroviruses have been disarmed and are now used to deliver desirable genes into animal cells.
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