Which one of the following comes into existence when bacterial plasmid naturally modified to produce it?
Correct answer: A. pBR 322
- A. pBR 322
- B. Npq 303
- C. oSR 210
- D. kMG 319
Explanation
The correct answer is pBR 322. Plasmids like pBR 322 are naturally occurring extrachromosomal DNA molecules in bacteria that have been modified to serve as vectors in genetic engineering. These plasmids can carry genes for antibiotic resistance, making them useful in gene cloning and other molecular biology applications. The other options, Npq 303, oSR 210, and kMG 319, do not correspond to known plasmids and are not used in this context.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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