- A single-stranded DNA
- B a plasmid vector
- C a restriction enzyme
- D double-stranded RNA
Correct answer: D. double-stranded RNA
Explanation: RNAi is triggered by double-stranded RNA, which silences the complementary nematode mRNA and stops the parasite.
Concept context
GM crops, transgenic animals, gene therapy, molecular diagnostics, and bioethics. Frequent 2–3 mark questions in NEET.