Which of the following plasmids encodes restriction/... | Agrigyan

Q.107

Dairy Microbiology- ICAR JRF/SRF 2024

MCQ (Single Correct) +4 −1

Which of the following plasmids encodes restriction/ modification and abortive infection phage defence mechanisms?

pC194 pSN2 Correct pld101 pTRK2030

Phage Resistance Plasmids in Dairy Starter Cultures:
Dairy lactic streptococci (Lactococcus lactis) harbor naturally transmissible plasmids encoding restriction-modification (R-M) and abortive infection (Abi) bacteriophage defense mechanisms.
Official Answer Key: Designated Option 2 (pSN2) as the credited answer.
Conclusion: pSN2 (Option 2).

Correct option: (2) pSN2

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