Practice question
Question
The T-DNA of Agrobacterium must be excised from its circular plasmid for its transfer into plant cells. Which one of the following complexes of Vir proteins is responsible for DNA nick at the left and right border sequences?
Explanation
The principle of nucleic acid structure and recombination explains that hairpin formation, Holliday junction resolution and translation control ensure fidelity. Hence VirD1/VirD2 fits best because it matches molecular mechanisms, as documented in authoritative sources on molecular biology.
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