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. Preliminary clinical results with a humanized antibody against the interleukin-2 receptor have suggested the
A. absence of human immune response against murine proteins (HAMA) response
B. presence of HAMA response
C. poor recognition of immunoglobulin, Ig constant regions
D. all of the above
2. Which of the following microorganisms leach metals out of rock ores and can accumulate silver?
A. Pseudomonas aeruginosa
B. Thiobacillus
C. Pseudomonas putida
D. Zoogloea ramigera
3. Auxanometer is used for measuring
A. respiratory activity
B. photosynthetic activity
C. growth activity
D. osmotic pressure
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. The movement of most minerals, including potassium into root cells is by
A. osmosis
B. diffusion
C. bulk flow
D. active transport
6. 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
7. Some types of variation are due to changes in the genetic material. What is this type of change called?
A. Fertilisation
B. Mutation
C. Radiation
D. Sterilisation
8. pBR 322 has/have which of the following selection marker(s)?
A. Ampr
B. Tetr
C. Both A and B
D. Kanr
9. Yeast Replicating plasmids (YRp) carry
A. centromere
B. telomere
C. autonomously replicating sequence
D. both A and (c)
10. 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
11. Electroporation is
A. the process of separating charged molecules through a gel maintained in an electric field
B. the process of combining foreign DNA to an electrically charged vector molecule
C. the application of high voltage pulses
D. the process of multiplication of the cells
12. Virulence trait of Agrobacterium tumefaciens is borne on
A. chromosomal DNA
B. tumour inducing plasmid DNA
C. both chromosomal and plasmid DNA
D. cryptic plasmid DNA
13. Which of the following is not true about synthetic seeds?
A. Can be stored for a year without the loss of valuables
B. Easy to handle
C. Can be directly sown in the soil like natural seeds
D. Need hardening in the green house
14. Which is not true about a photon?
A. It is a packet of light energy
B. The shorter the wavelength, the greater the energy of the photons
C. It is trapped by photosynthetic unit
D. It donates electron to reduce carbon dioxide to glucose
15. Which of the following bacteria genus is capable of oxidizing ammonia (NH4)?
A. Nitrospina
B. Nitrobacter
C. Nitrosococcus
D. Nitrosobacter
16. Which of the following microorganism is used for the production of citric acid?
A. Lactobacillus bulgaricus
B. Saccharomyces cerevisiae
C. Aspergillus niger
D. Streptococcus lactis
17. Which of the following is not true about phagemid?
A. Contain functional origin of replication of the plasmid and ? phage
B. May be propagated as a plasmid or as phage in appropriate strain
C. Contain ? att site
D. Can only be propagated as phage
18. Synthetic seeds are
A. artificially synthesized seeds
B. somatic embryos encapsulated in suitable matrix
C. seeds of plants modified genetically
D. none of these
19. 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
20. The event(s) which does not occur during interphase, is/are
A. Chromatin condenses
B. Protein Synthesis
C. Organelles replication
D. DNA replication
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