E-PolyLearning

16. Integrated octopine T DNA occurs as
a. single segment
b. two segments
c. three segments
d. four segments
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Answer: (b).two segments

17. Liposomes mediated gene transfer in plants involves
a. plasmid DNA enclosed in a lipid bag
b. fusion of liposomes with protoplast
c. use of polyethylene glycol (PEG)
d. all of the above
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Answer: (d).all of the above

18. Which of the following plant signal molecules regulate the expression of vir B, C, D and E in case of tobacco?
a. Acetosyringone
b. α-hydroxy syringone
c. Both (a) and (b)
d. None of these
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Answer: (c).Both (a) and (b)

19. In a plant tumour cell
a. complete Ti plasmid is incorporated in plant nuclear DNA
b. different parts of the Ti-plasmid are incorporated
c. only a small specific segment of callus T DNA is incorporated
d. may vary from plant to plant
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Answer: (c).only a small specific segment of callus T DNA is incorporated

20. Co-integrating transformation vectors must include a region of homology in
a. the vector plasmid
b. the Ti-plasmid
c. between vector plasmid and Ti-plasmid
d. none of these
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Answer: (c).between vector plasmid and Ti-plasmid

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