Gene Transfer in Plants
The left segment of octopine T-DNA (TL) is necessary for

all of these
conjugative transfer
tumour formation
enzymes for agropine biosynthesis

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Gene Transfer in Plants
Crown gall tissue

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

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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

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

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