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. Ethanol is produced by
A. continuous fermentation
B. batch fermentation
C. both A and B
D. none of these
2. The cross linkage of antigens by antibodies is known as
A. agglutination
B. complement fixation
C. a cross reaction
D. all of these
3. Chemically synthesized DNA sequences for the two chains are separately inserted into the plasmid pBR 322 by the side of
A. ß-Galactosidase
B. galactokinase
C. acid phosphatase
D. glucokinase
4. Nitrogen in the plant cell culture media is provided by either ammonia or nitrate salt. In the media
A. utilization of ammonium cause culture pH to drop while utilization of nitrate cause culture pH to rise
B. utilization of nitrate cause culture pH to drop while utilization of ammonium cause culture pH to rise
C. utilization of both ammonium and nitrate result in rise in pH
D. utilization of both ammonium and nitrate result in drop in pH
5. Which of the following has been confirmed on sugarcane genotypes?
A. Bacilliform virus
B. Cytomegalovirus
C. Varicella-zoster virus
D. Erythrovirus
6. Which of the following is used to check vortex and to improve aeration efficiency in a fermentor?
A. Impeller
B. Baffles
C. Sparger
D. All of these
7. Retroviruses have advantage for being used as vector for animal cells because
A. they cover a wide host range
B. infection does not lead to cell death, infected cells produce virus over an indefinite period
C. viral gene expression is driven by strong promoters
D. all of the above
8. 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
9. 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
10. 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
11. Spirit vinegar is produced from
A. fruit juices
B. malted grain
C. ethanol
D. ale
12. Phloem is composed of
A. vessel elements and companion cells
B. tracheids and vessel elements
C. sieve-tube elements and companion cells
D. tracheids and sieve-tube elements
13. Inundation involves use of a/an
A. large number of organisms over a short time to suppress/destroy a population
B. organism over a short time to suppress/destroy a population
C. large number of organisms over a long time to suppress/destroy a population
D. organism over a long time to suppress/destroy a population
14. Milbemycin is known to exhibit a broad spectrum of activity against
A. agricultural pests
B. agricultural herbs
C. agricultural insects
D. all of these
15. 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
16. Range of osmolarity tolerated/accepted in mOsm/Kg of H2O by mammalian cells is
A. 150-300
B. 280-360
C. 300-325
D. 360-400
17. Which is the most common carbon source used in the plant cell culture media?
A. Sucrose
B. Glucose
C. Fructose
D. Maltose
18. Which of the following is true for the ale beer?
A. Top yeast of S cerevisiae is used
B. Fermentation is quick and completes in 5-7 days
C. Quantity of hops used is more than in lager beer
D. All of the above
19. Which of the following growth regulator promote cell division?
A. Auxins
B. Cytokinins
C. Gibberellins
D. Brassinosteroids
20. What is the desirable sugar content of the grapes required for the wine production?
A. 2-5%
B. 5-10%
C. 10-14%
D. 14-20%
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