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

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

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

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