Gene Transfer in Plants
Which of the following is not true about the helper plasmids?

All of these
These can replicate in Agrobacterium
These can't replicate in Agrobacterium
These help in the mediating conjugation of intermediate vectors

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Gene Transfer in Plants
Virulent strains of Agrobacterium contain large Ti-plasmids, which are responsible for the DNA transfer and subsequent disease symptoms. It has been shown that Ti-plasmids contain

one set of sequence necessary for gene transfer
two sets of sequence necessary for gene transfer
four sets of sequence necessary for gene transfer
three sets of sequence necessary for gene transfer

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