Q. The terms SDN-1, SDN-2, and SDN-3 are frequently discussed in scientific literature in the context of:

[A] Biological methods for carbon sequestration.

[B] Targeted genome editing in organisms using Site-Directed Nucleases.

[C] Developing next-generation antimicrobial resistance coatings.

[D] Enhancing the efficiency of Third-Generation Biofuels.

Answer: B
Notes:

Explanation:

SDN stands for Site-Directed Nucleases. These are categories of gene editing (like CRISPR).

  • SDN-1 involves small insertions/deletions without external DNA.
  • SDN-2 uses a small repair template to edit DNA.
  • SDN-3 involves inserting large segments of foreign DNA.

The Government of India recently exempted SDN-1 and SDN-2 from the stringent GM regulations applied to transgenic crops.

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