Gene Transfer in Plants
Virulence trait of Agrobacterium tumefaciens is borne on

cryptic plasmid DNA
both chromosomal and plasmid DNA
chromosomal DNA
tumour inducing plasmid DNA

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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

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

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Gene Transfer in Plants
Crown gall tissue

both (a) and (b)
retains tumorous properties when cultivated
can be cultivated in vitro in absence of bacteria
shows tumorous properties only in presence of bacteria

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