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  • BioTecNika Model Test Papers

    for CSIR NET Life Sciences

    June 2013 Examination

    Practice Today with the best Model papers. Get to know where you stand in

    the competition

  • Part A

    1. The distance between the cities M and N is 275 km

    along the rail-route and 185 km, along the aerial route. How many hours shorter is the trip by plane traveling at 250km/hr. than by train traveling at 80 km/hr?

    a) 2 hrs b) 2 hrs 41 mins c) 3 hrs d) 3 hrs 20 mins 2. How many kg of wheat costing Rs.6.10 /kg must be

    mixed with 126 kg of wheat costing Rs.2.85/kg, so that 15% may be gained by selling the mixture at s.4.60/kg?

    a) Rs. 3 b) Rs. 4 c) Rs. 5 d) Rs. 6 3. A mixture of 40 litres of milk contains 20% of water.

    How much water must be added to make the water 25% in the new mixture?

    a) 5 litres b) 5.3/4 litres c) 6.2/3 litres d) 7 litres 4. If a man can save Rs.5 more every year than he did

    the year before and if he saves 25 rupees in the first year after how many years will his savings be more than 000 rupees altogether and what will be the exact sum with him?

    a) Rs 1000 b) Rs 1100 c) Rs 1200 d) Rs 1220 5. There are 728 students in a school, 162 come to the

    school by bus, 384 on bicycles and the rest by walk. What percentage of students comes to the school by walk?

    a) 25% b) 26% c) 27% d) 28% 6. The owner of a restaurant started with an initial

    investment of Rs.32,000. In the first year of operation, he incurred a loss of 5%. However, during the second and the third years of operation, he made a profit of 10% and 12.5% respectively. What is his net profit for the entire period of three years? Assume that profit or loss are added or deducted from investment.

    a) 16.5% b) 17.56% c) 18.35%

    d) 18.65% 7. In a race A has a start of 100 mtrs and sets off 6 min

    before B, at the rate of 10 km/hr. How soon will B overtake A, if his speed of running is 12 km/hr.

    a) 30 mins b) 33 mins c) 35 mins d) 37 mins 8. What rate of C.I for a sum of Rs.6000 will amount to

    Rs.6720 in 2 years if the interest is calculated every year?

    a) 5.6% b) 5.83% c) 6.4% d) 6.6% 9. Two clocks begin to strike 12 together. One strikes in

    33 seconds and the other in 22 secs. What is the interval between the 6

    th stroke of the first and the 8th

    stroke of the second? a) 1 sec b) 3 sec c) 4 sec d) 5 sec 10. Today is 3rd November. The day of the week is

    Monday. This is a leap year. What will be the day of the week on this day after 3 years?

    a) Wednesday b) Thursday c) Friday d) Saturday 11. The length of a room is 6m and the length is twice the

    breadth. If the area of the floor is 162m2, find the area

    of the four walls of the room. a)

    320 m2

    b) 324 m2

    c) 330 m2

    d) 332 m2

    12. The price of paint is Rs.100 per kg. A kilogram of

    paint covers 25sq.m. How much will it cost to paint the inner walls and the ceiling of a room having 6 meters each side?

    a) Rs. 650 b) Rs. 680 c) Rs. 720 d) Rs. 750 13. A man left Rs.1750 to be divided among his two

    daughters and four sons. Each daughter was to receive three times as much as a son. How much did each son and daughter receive?

    a) Son: Rs. 150; Daughter: Rs. 600 b) Son: Rs. 200; Daughter: Rs. 550 c) Son: Rs. 175; Daughter: Rs. 525 d) Son: Rs. 125; Daughter: Rs. 625

  • 14. A two digit number is less than 3 times the product of

    a) 60 b) 62 c) 64 d) 68 15. Two friends A and B start on a holiday together, A

    with Rs.380 and B with Rs.260. During the holiday, B spends 4 rupees more than A and when holidays end, A has 5 times as much as B. How much has each spent?

    a) A: Rs. 380; B: Rs. 260 b) A: Rs. 360 ; B: Rs. 280 c) A: Rs. 340; B: Rs. 300 d) A: Rs. 400; B: Rs. 240

    Part B

    16. A gene coding for histone protein is mutated such that a positively charged amino acid is substituted with a negatively amino acid. The most likely result is

    a) Cytoplasmic localization of histone b) Formation of constitutive heterochromatin c) Suppression of gene expression d) Less binding of Histones with DNA 17.

    oxygen consumption (respiratory burst) in neutrophils. This is an essential step for which of the following events?

    a) Generation of microbicidal activity b) Phagocytosis of bacteria c) Opsonization of bacteria d) Attachment to the endothelial cells 18. If you were shipping strawberries to a supermarket

    thousands of miles away, which of the following chemicals would you want to eliminate from the plants environment?

    a) cytokinins b) ethylene c) auxin d) gibberellic acids 19. Which of the following is not an observation or

    selection is based? a) Poorly adapted individuals never produce offsprings b) There is heritable variation among individuals c) Because of overproduction of offsprings, there is

    competition for limited resources d) Individuals whose characteristics best fit to the

    environment will generally produce more offsprings 20. When the terminal bud of a plant are removed it

    showed apical dominance will can result in a) an increase in the growth of the root system.

    b) an increase in the size of the leaves c) increased growth of the terminal bud. d) increased growth of the axillary buds 21. Those mutations that arise in the absence of known

    mutagen are known a) Induced mutation b) Fused mutation c) Spontaneous mutation d) None of the above 22. Which of the following is key player is formation of

    short term memory? a) cGMP b) cAMP c) ATP d) GTP 23. In a population at large, there is a rare disease that

    affects one person in a thousand. A diagnostic test for the disease is 99% accurate. This means that there is a 1% chance that the test wrongly identifies a healthy person as having the disease. Suppose you take the test and the result is positive. Then the chance that you indeed have the disease is about

    a) 9% b) 1% c) 50% d) 0.1% 24. What is the difference between a threatened species

    and an endangered species? a) A threatened species means that the population is

    likely to become endangered An endangered species has population numbers so low that it is likely to become extinct

    b) A threatened species is already extinct. An

    numbers have increased greatly over the last 5 years c) A threatened species means that the population is

    likely to become endangered. An endangered species is already extinct

    d) A threatened species and an endangered species are the same thing

    25. In plants a common deficiency caused by deficiency

    of P, K, Ca and Mg is the

    a) Suppressed synthesis of phytochromes b) Bending of leaf tip c) Suppressed development of vascular tissues d) Formation of dead necrotic areas 26. Which of the following should not be described as

    'migration'? a) The movement of young male rodents away from the

    territories in which they were born b) The movement of crabs up and down the shore with

    the tides.

  • c) The practice of transhumance, moving flocks of sheep and goats up to mountain pastures in summer and down again in the fall

    d) The movement of planktonic plants to the upper layers of the water in lakes during the day and to the lower, nutrient-rich depths at night

    27. The trickling filter at a sewage treatment plant works

    by a) passing wastewater through fine sand, mechanically

    removing fine pollution particles. b) forcing wastewater through a membrane filtration

    system, producing drinkable water. c) passing wastewater through a thick bed of rocks that

    contain chemicals that sterilize the water and neutralize chemical pollutants or bind with them to produce a harmless precipitate.

    d) passing wastewater through a thick bed of rocks. Biofilms of bacteria and fungi on the rocks absorb and decompose organic material dissolved in the wastewater.

    28. Osmosis is the diffusion of a solution of a weaker

    concentration, when both are separated by semi-permeable membrane. The error in this statement is

    a) Pore size of semi-permeable membrane is not specified

    b) Diffusion Pressure Deficit (DPD) value is not specified

    c) Exact concentration of solution is not specified d) The movement of water molecules is not specified 29. An E. coli culture has the genotype I

    SP

    +O

    +Z

    +Y

    +A

    +.

    The phenotype of this culture in presence of lactose as sole carbon source will be

    a) Expression of both -galactosidase and lac permease

    b) No expression of -galactosidase and lac permease

    c) Expression of -galactosidase and no expression of

    d) Expression of lac permease and no expression of -galactosidase

    30. Consider a heritable autosomal disease with an

    incidence in the population of 1 per thousand. On average, individuals with the disease have 80% as many children as the population average. What mutation rate would be required to maintain the observed incidence of the disease in the population if the disease is dominant?

    a) 0.01 b) 0.001 c) 0.0001 d) 0.00001 31. Which of the following statements correctly describes

    the outcome of competition between the sea palm and the mussel?

    a) The mussels always outcompete the sea palms.

    b) The sea palms always outcompete the mussels c) The sea palms colonize gaps but are eventually

    outcompeted by encroaching mussels; sea palms coexist with mussels because gaps are always forming.

    d) The mussels colonize gaps but are eventually outcompeted by encroaching sea palms; mussels coexist with sea palms because gaps are always forming.

    32. Smol and Xmal are isoschizomers. A circular DNA

    has two SmaI and one XmaI sites where as a linear DNA as two sites for XmaI and one site for SmaI. How many fragments will be generated by digestion both the circular and linear DNA with Xmal?

    a) 2 and 3 b) 1 and 3 c) 2 and 2 d) 3 and 3 33. The label on a container of margarine lists

    "hydrogenated vegetable oil" as the major ingredient. What is the result of adding hydrogens to vegetable oil?

    a) The hydrogenated vegetable oil has a lower melting point

    b) The hydrogenated vegetable oil stays solid at room temperature

    c) The hydrogenated vegetable oil has more "kinks" in the fatty acid chains

    d) The hydrogenated vegetable oil has fewer trans fatty acids

    34. The R group or side chain of the amino acid serine is

    CH2 OH. The R group or side chain of the amino

    acid leucine is CH2 CH (CH3)2. Where would you

    expect to find these amino acids in a globular protein in aqueous solution?

    a) Serine would be in the interior, and leucine would be on the exterior of the globular protein

    b) Leucine would be in the interior, and serine would be on the exterior of the globular protein.

    c) Both serine and leucine would be in the interior of the globular protein.

    d) Both serine and leucine would be on the exterior of the globular protein

    35. On average, how many fragments would a restriction

    enzyme which recognizes a specific 4 base sequence in DNA be expected to cleave a double-stranded bacteriophage with a genome size of 5,000 bp into?

    a) about 2 b) about 4 c) about 20 d) about 50

  • 36. In general tropical rainforests are known to have a very high diversity of species. Which of the following is the least plausible explanation for this pattern?

    a) Rainfall b) Temperature c) Latitude d) Longitude 37. If one strand of a DNA molecule has the sequence of

    bases 5'ATTGCA3', the other complementary strand would have the sequence

    a) 5'TAACGT3'. b) 5'TGCAAT3' c) d) 3'UAACGU5' 38. Tay-Sachs disease is a human genetic abnormality

    that results in cells accumulating and becoming clogged with very large and complex lipids. Which cellular organelle must be involved in this condition?

    a) the endoplasmic reticulum b) the Golgi apparatus c) the lysosome d) membrane-bound ribosomes 39. The rate of photosynthesis can be enhanced if

    monochromatic beams of 2 different wavelengths are applied simultaneously. If the two wavelengths are given separately, the sum total is less. This effect is called

    a) Hills Effect b) Emerson effect c) Lang effect d) Yang effect 40. During developmental stages of drosphila, the protein

    bicoid and nanos are involved in a) setting up the anterior-posterior body axis b) setting up the posterior-anterior body axis c) setting up the ventral- dorsal body axis d) setting up the dorsal-ventral body axis 41. Many different classes of drugs are used as anti-

    tumor agents. The rationale for each different drug takes advantage of a particular property of tumor cells compared to normal cells. Recently, inhibition of angiogenesis has become an important potential avenue of cancer chemotherapy. Inhibition of angiogenesis could result in inhibiting tumor growth by blocking

    a) Metastasis directly b) New blood vessel formation c) Telomerase activity d) Tumor cell proliferation directly 42. Grass seedlings have a sheath called the coleoptile

    that surrounds the first set of leaves. Growth of the coleoptile depends on the tip, and removal of the tip stops growth. Adding the tip back resumes the growth of tip. If a gelatine sheet is placed on the cut

    surface and then the tip is placed back then it is observed that

    a) Growth of coleptile continues b) Growth of coleptile stops c) Coleoptile does not bend towards light d) Growth of roots stops 43. Which of the following statements correctly describes

    some aspect of protein secretion from prokaryotic cells?

    a) Prokaryotes are unlikely to be able to secrete proteins because they lack an endomembrane system

    b) The mechanism of protein secretion in prokaryotes is probably the same as that in eukaryotes

    c) Proteins that are secreted by prokaryotes are synthesized on ribosomes that are bound to the cytoplasmic surface of the plasma membrane

    d) In prokaryotes, the ribosomes that are used for the synthesis of secreted proteins are located outside of the cell

    44. In animal metabolism, most of the monomers

    released by digestion of food macromolecules are metabolized to provide energy. Only a small portion of these monomers are used for synthesis of new macromolecules. The net result is that

    a) water is generated by animal metabolism b) water is consumed by animal metabolism. c) the water consumed is exactly balanced by the water

    generated, to maintain homeostasis d) water is consumed during homeostasis, but water is

    generated during periods of growth 45. After infection with Mycobacterium tuberculosis, a

    granuloma forms in the lung. Within the granuloma are cells expressing class II MHC antigens. These cells elaborate cytokines that promote fibroblastic proliferation. From which of the following peripheral blood cells are these cells derived?

    a) Neutrophil b) Monocyte c) B Cell d) NK cell 46. If radioactive deoxythymidine triphosphate (dTTP) is

    added to a culture of rapidly growing bacterial cells, where in the cell would you expect to find the greatest concentration of radioactivity?

    a) nucleus b) cytoplasm c) endoplasmic reticulum d) nucleoid 47. When several EPSPs arrive at the axon hillock from

    different dendritic locations, depolarizing the postsynaptic cell to threshold for an action potential, this is an example of

    a) temporal summation b) spatial summation.