Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
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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. Any system that is not at equilibrium
A. Is thermodynamically unstable, although it may be kinetically stable 
B. Is rushing toward equilibrium at a very rapid rate 
C. Requires an enzyme to reach equilibrium 
D. Is kinetically unstable, although it may be thermodynamically stable 

2. Agrobacterium tumefaciens is
A. A fungi that is used to produce antibiotics in large amounts 
B. A disease in humans that causes loss of weight 
C. A bacterium that can be used to introduce DNA into plants 
D. A disease in humans that causes loss of sight 

3. Which of the following microorganisms leach metals out of rock ores and can accumulate silver?
A. Thiobacillus 
B. Pseudomonas aeruginosa 
C. Pseudomonas putida 
D. Zoogloea ramigera 

4. 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 

5. How many nucleotides are there in Ss RNA molecule of picorna virus causing FMD?
A. 1000 
B. 5000 
C. 8000 
D. 10000 

6. 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 

7. pH of the fermentation medium for chlorotetracyclins is
A. 5-6 
B. 6-7 
C. 7-8 
D. 8-9 

8. A short molecule containing 2-20 nucleotide is
A. Plasmid 
B. Vector 
C. Oligonucleotide 
D. Mononucleotide 

9. 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 donates electron to reduce carbon dioxide to glucose 
D. It is trapped by photosynthetic unit 

10. Avermectins (AVM) are macrocyclic lactones which have potent antihelminthic and insecticidal action. They are generally derived from the mycelia of
A. Streptomyces avermitilis 
B. P. flourescens 
C. L. peruvianum 
D. A 

11. A group of about 300 chlorophyll molecule acting together to trap photons and transfer energy to the pigment molecule at the reaction center may be called as
A. Harvesting unit 
B. Reaction center 
C. Photosynthetic unit 
D. Chloromass 

12. 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 

13. What is meant by 'Organ culture' ?
A. Maintenance alive of a whole organ, after removal from the organism by partial immersion in a nutrient fluid 
B. The aspects of culture in community which are mainly dedicated by the need of a specified organ of the human body 
C. Cultivation of organs in a laboratory through the synthesis of tissues 
D. Introduction of a new organ in an animal body with a view to create genetic mutation in the progenies of that animal 

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. 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% 

16. For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to
A. Precipitate calcium sulphate 
B. Precipitate calcium carbonate 
C. Precipitate calcium citrate 
D. Precipitate calcium phosphate 

17. The yeast generated during the fermentation of beer is generally separated by
A. Centrifugation 
B. Filtration 
C. Cell disruption 
D. All of these 

18. Which of the following is the process of choosing parent organisms for the characteristics that is wanted in their offspring?
A. Selective breeding 
B. Reproductive selection 
C. Breeding selection 
D. Active selection 

19. Which protein has been produced generating a transgenic sheep that is used for replacement therapy for individuals at risk from emphysema?
A. Plasminogen activator (tPA) 
B. A-anti trypsin (AAT) 
C. Casein 
D. Amyloid precursor proteins 

20. If starch containing substrates are used for ethanol production, yeast strain can't be used directly because
A. It doesn't contain amylases to hydrolyze starch 
B. Starch is not a suitable substrate for the production of ethanol 
C. It is converted to pentose sugar 
D. None of the above 

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