36. Which of the following are used as selection marker for the cells transformed with Agrobacterium?

A. Neomycin phosphotransferase
B. Streptomycin phosphotransferase
C. Hygromycin phosphotransferase
D. any of the above

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37. Vir genes required for the T-DNA transfer and processing are located

A. on the T-DNA
B. outside the T-DNA region
C. on the plant genome
D. none of these

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38. Plant transformation vectors based on Agrobacterium can generally be divided into

A. two vectors
B. four vectors
C. six vectors
D. eight vectors

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