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

conjugative transfer
all of these
enzymes for agropine biosynthesis
tumour formation

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Gene Transfer in Plants
Crown gall tissue

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

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

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