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. The chief source of nitrogen for green plants is
A. atmospheric nitrogen
B. nitrates
C. ammonium salts
D. low molecular weight- organic nitrogenous compound
2. Metabolic interference is a term used to describe a method to metabolize a compound and prevent the synthesis of something that is normally produced. What compound(s) have been targeted for metabolic interference in tomato?
A. ACC (1-aminocyclopropane-1-carboxylic acid)
B. SAM (S-adenosylmethionine)
C. Both A and B
D. AOA (aminooxyacetic acid)
3. The production of high quality and uniform embryos has been limited to only
A. carrot
B. alfalfa
C. both A and B
D. sandalwood
4. Human serum albumin has been synthesized by
A. transgenic potato and tobacco plants
B. transgenic maize plants
C. transgenic wheat plants
D. any of the above
5. Which group of plants has the greatest diversity (i.e. the most species) living today?
A. Bryophyta
B. Lycophyta
C. Gymnosperms
D. Angiosperms
6. Which of the modification in hemoglobin is the cause of sickle cell anemia?
A. A mutation in the beta chain
B. A deletion in the beta chain
C. Replacement of the B chain by D chain
D. None of the above
7. Sugar content of the fermentation medium for citric acid is maintained at
A. 10-15%
B. 15-20%
C. 20-25 %
D. 25-30 %
8. Klinefelter syndrome is a manifestation of which chromosome aneuploidy?
A. XXX
B. XYY
C. XXY
D. None of these
9. The piece of equipment, that introduces DNA into cells via DNA-coated microprojectiles is known as
A. laser
B. DNA probe
C. gene gun
D. inoculating needle
10. Using bovine papilloma virus (BPV) derived vectors, permanent cell lines can be obtained carrying a recombinant DNA
A. episomally only
B. integrated only
C. either episomally or integrated at high copy number
D. either episomally or integrated at low copy number
11. Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are
A. DNA ligase
B. helicases
C. restriction endonucleases
D. DNA gyrase
12. The evaporation of water from leaves is called
A. transpiration
B. cohesion
C. tension
D. pressure flow
13. Accumulation of lactate leads to
A. increase in pH
B. no change in pH
C. reduction in the pH of culture hence loss of cell viability
D. no loss of cell viability
14. The tumor phenotype, which can be maintained indefinitely in tissue culture, results from the expression of genes on the
A. T-DNA
B. c-DNA
C. r-DNA
D. m-RNA
15. Which type of restriction endonuclease cuts the DNA within the recognition site?
A. Type I
B. Type II
C. Type III
D. All of the these
16. The deliberate modifications of an organism's genetic information by directly changing its nucleic acid content is a subject matter of
A. genetic engineering
B. population genetics
C. microbiology
D. protein engineering
17. pBR 322 has/have which of the following selection marker(s)?
A. Ampr
B. Tetr
C. Both A and B
D. Kanr
18. 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
19. Which of the following from a blood clot stimulates the growth of cells in the healing process?
A. EGF
B. PDGF
C. MPF
D. NGF
20. Which of the following viruses are used as vectors for transferring genes to animal cells?
A. SV 40 virus
B. Bovine papilloma virus (BVP)
C. Retroviruses
D. All of these
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