A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Involvement of sugarcane phytoalexins in red-hot resistance has been observed. The phytoalexin compound is reported to be
A. 3-deoxyanthocyanidin
B. luteolinidin
C. apigeninidin
D. 5-0 apigeninidin
2. Final alcohol content in wine varies from
A. 6-9 % by weight
B. 8-13 % by weight
C. both A and B
D. 13-15 % by weight
3. Difference between ? gt 10 and ? gt 11 vectors is that
A. ? gt 11 is an expression vector
B. ? gt 10 is an expression vector
C. ? gt 10 is a replacement vector
D. ? gt 11 is a replacement vector
4. The production of high quality and uniform embryos has been limited to only
A. carrot
B. alfalfa
C. both A and B
D. sandalwood
5. For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to
A. precipitate calcium carbonate
B. precipitate calcium citrate
C. precipitate calcium phosphate
D. precipitate calcium sulphate
6. The yield of the antibiotic depends upon
A. pH of the medium
B. age of the inoculum
C. composition of the medium
D. all of these
7. Which of the following is the word used to describe what happens when the nucleus of a sperm joins with the nucleus of an egg cell?
A. Sex
B. Fertilisation
C. Intercourse
D. Reproduction
8. Agrobacterium tumefaciens is
A. a disease in humans that causes loss of sight
B. a bacterium that can be used to introduce DNA into plants
C. a fungi that is used to produce antibiotics in large amounts
D. a disease in humans that causes loss of weight
9. Disaggregating of cells can be achieved by
A. physical disruption
B. enzymatic digestion
C. treating with chelating agents
D. all of the above
10. Which tropical fruit crop has been successfully engineered to be protected against a lethal virus?
A. Passion fruit
B. Papaya
C. Mango
D. Lychee
11. Which of the following is not true about the helper plasmids?
A. These can replicate in Agrobacterium
B. These help in the mediating conjugation of intermediate vectors
C. These can't replicate in Agrobacterium
D. All of the above
12. Recombinant adeno virus can be created by deleting E1A/E 1B genes that are
A. transcriptional regulators and are essential for viral replication
B. not necessary for viral replication
C. coding for virus coat protein
D. important for packaging of viral DNA into viral head
13. The controversy regarding the use of Bt corn is that it
A. is potentially harmful to monarch butterflies
B. is a potential allergen to humans
C. both A and B
D. can contaminate groundwater
14. The yeast generated during the fermentation of beer is generally separated by
A. centrifugation
B. filtration
C. cell disruption
D. all of these
15. Recombinant vaccine for Hepatitis B virus has been synthesized against which of the following antigen?
A. Viral core antigen (HBcAg)
B. Viral surface antigen (HBsAg)
C. e antigen (HBeAg)
D. All of the above
16. Which group of plants has the greatest diversity (i.e. the most species) living today?
A. Bryophyta
B. Lycophyta
C. Gymnosperms
D. Angiosperms
17. For culturing, plasma from the adult chicken is preferred to mammalian plasma because
A. it forms a clear and solid coagulum even after dilution
B. it is too opaque
C. it doesn't produce solid clots
D. it forms a semi solid coagulum
18. The gene coding for VP1 is cloned in
A. pMB 9
B. pBR 322
C. pUC 18
D. pUC 19
19. For gene probes to be useful they must
A. be large enough to contain gene-specific sequences
B. be labeled in some manner to allow detection
C. both A and B
D. none of the above
20. The size of the virulent plasmid of Agrobacterium tumefaciens is
A. 40-80 kb
B. 80-120 kb
C. 140-235 kb
D. >235 kb
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