26. YAC vectors can be used to obtain artificial chromosomes because it carries

A. centromere
B. telomere
C. autonomously replicating sequence
D. all of these

27. Maximum insert size in case of adenovirus vectors is

A. 6-8 kb
B. 4-6 kb
C. 10-12 kb
D. 20 kb

28. SV 40 vectors, in which late region replacements are done, require

A. COS cell line
B. SV 40 helper virus
C. pBR 322 vector
D. none of these

29. Which of the following(s) is/are the most commonly used markers in yeast?

A. His 3
B. Ura 3
C. Trp 1
D. All of these

30. Which of the following are produced in high copy number?

A. YEp
B. YRp
C. Both (a) and (b)
D. YCp