Gene Transfer in Plants
Which of the following plant signal molecules regulate the expression of vir B, C, D and E in case of tobacco?

None of these
α-hydroxy syringone
Both (a) and (b)
Acetosyringone

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

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