Gene Transfer in Plants
Which of the following is not true about the direct repeats flanking T-DNA?

These repeats are transferred intact to the plant genome
These are important in integration mechanism
All of these
They are conserved between nopaline and octopine Ti-plasmids

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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
four 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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Gene Transfer in Plants
Opines are

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

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Gene Transfer in Plants
Crown gall tissue

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

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