The three-strand structure involved in strand invasion is:

Question

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The D-loop is a three-stranded structure that forms during strand invasion, which is a key step in homologous recombination. The D-loop consists of the single-stranded DNA from the invading strand, paired with a complementary strand on the recipient molecule, as well as the displaced strand from the recipient molecule that forms a loop with the invading strand.

Answer: D
 Non-Watson-Crick pairing refers to base pairing that does not follow the standard rules of A-T and G-C base pairing, but rather involves different types of base interactions. This type of pairing is involved in processes such as RNA folding and modification, as well as DNA repair and recombination. During strand invasion, non-Watson-Crick pairing plays a role in stabilizing the three-stranded D-loop structure.

The Three-Strand Structure Involved in Strand Invasion Is