31. 5-fluoro orotic acid inhibits the growth if one of the following markers is present in the yeast. That is

A. His 3
B. Lys 2
C. Ura 3
D. Trp 1

32. Which of the following promoters is repressed in the presence of glucose?

A. Galactokinase (GAL 1)
B. Acid phosphatase (PHOS)
C. Both (a) and (b)
D. Phosphoglycerate kinase (PGK)

33. Which of the following can be used for reducing the size of gene inserts containing introns?

A. Vaccinia virus
B. Baculo virus
C. Retrovirus
D. none of these

34. Bovine papillomavirus has a circular double-stranded DNA genome of about

A. 2.5 kb
B. 5.2 kb
C. 7.9 kb
D. 9.5 kb

35. Retroviruses consist of

A. Ds DNA genome
B. Ss DNA genome
C. RNA genome
D. cDNA genome