Gene Transfer in Plants
Crown gall tissue

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

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Gene Transfer in Plants
Opines are

amino acid derivatives found in both normal as well as tumor tissues
None of these
amino acid derivatives found in tumor tissues
amino acid derivatives found in normal tissues

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

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