Final answer:
VirD2/VirD1 and TraI/TraY both facilitate the transfer of DNA between cells, with the former involved in T-DNA transfer to plant cells and the latter in bacterial conjugation.
Step-by-step explanation:
The statement that VirD2/VirD1 perform a similar role to TraI/TraY is true. VirD2 and VirD1 are proteins involved in the process of T-DNA transfer from Agrobacterium tumefaciens to plant cells, while TraI and TraY are involved in bacterial conjugation, which is the transfer of genetic material between bacteria via direct cell-to-cell contact. Both systems involve the processing and transfer of DNA between cells, albeit in different contexts: VirD2/VirD1 in the context of plant pathogenicity and TraI/TraY in the context of bacterial conjugation.