MCQ LIFE SCIENCE FOR COMPETITIVE EXAM
1. The stain used to visualise motochondria is
(a) Fast green (b) Safranin (c) Aceto carmine (d) Janus green
2. A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is
(a) Complete Absence of mitochondria (b) Presence of cell wall
(c) Presence of haemoglobin (d) Complete Absence of nucleus
3. Regarding the mineral nutrition of plants, which one of the following statements is correct?
(a)The availability of iron to plants decrease with the increase of acidity of the soil
(b) The presence of CO2 dissolved in the soil water reduces the solubility of carbonates of lime in it
(c) Molybdenum is a constituent of nitrate reductasesystem
(d) Sulphur is a constituent of phenylalanine
4. In the life history of Fasciola hepatica, which one of the following is the correct sequence of stages?
(a) Miracidium, sporocyst, redia, cercaria, metacercaria
(b) Sporocyst, redia, miracidium, cercaria, metacercaria
(c) Cercaria, sporocyst, redia, miracidium metacercaria
(d) Miracidium, redia, cercaria, metacercaria, sporocyst
5. In the cell body of Paramecium, the elimination of excretory products takes place through the
(a) anus (b) cytostome (c) gullet (d) cytopyge
6. The skeleton-secreting cells of Sycon would include
(a) chondroblasts (b) fibroblasts (c) osteoblasts (d) scleroblasts
7. Which one of the following is present in the saliva of leeches?
(a) Heparin (b) Hemoglobin (c) Hirudin (d) Histamine
8. While doing some experiment with Amoeba proteus in a culture medium, it as found that the contractile vacuole of the protozoan disappeared, although the other organelles showed normal activity. This must have happened most probably due to
(a) change in the temperature of the medium
(b) change in the pH of the medium
(c) dilution of the medium with tap water
(d) dilution of the medium with sea water
9. Haemolymph of cockroach contains
(a) erythrocytes and plasma (b) respiratory pigments only
(c) haemocytes, leucocytes and plasma (d) haemocytes and plasma
10. Which one of the following sets is characteristic of the class Hirudinea?
Clitellum Spermathecae Fertilization Development
(a) Absent Absent Internal Direct
(b) Absent Absent External Indirect
(c) Present Present In cocoon Direct
(d) Present Present In cocoon Indirect
11. Since the first nucleotides cannot be linked in a newly synthesized strand in DNA replication, ___________ is required.
(a)a DNA primer (b)DNA polymerase (c)ligase (d)an RNA primer
12.With few exceptions, all nuclei of eukaryotes contain
(a)genes to specify the portion of the organism in which they are found
(b)all the information needed for growing the whole organism
(c)all of the chromosomes except sex chromosomes which are restricted to sex
organs
(d)single stranded DNA
13. During your summer job at Virotech, you isolate a previously unknown virus. Analysis of its genome reveals that it is composed of a double stranded DNA molecule containing 14% T (thymine). Based on this information, what would you predict the %C (cytosine) to be?
(a)14% (b)28% (c)36% (d)72%
14. For each acetyl Co-A oxidized by the citric acid cycle, what is the energy gain?
(a) TwoTwo molecules of NADH, one FADH 2 and one nucleoside triphosphate
(b) Three molecules of NADH, one FADH 2 and one nucleoside triphosphate
(c) Two molecules of NAIDH, one FADH 2 and two nucleoside triphosphate
(d) Three molecules of NAPH, one FADH 2 and two nucleoside triphosphate
15. Which one of the following causes tetany in young individuals?
(a) Hypoparathyroidism
(b) Hyperparathyroidism
(c) Hypothyroidism
(d) Hyperthyroidism
16. Consider the following statements:
A.The oxidative decarboxylation of pyruvate catalyzed by pyruvate dehydrogenase complex is a reversible oxidation process.
B. Four different vitamins required in human nutrition are components of pyruvate dehydrogenase complex.
Which of the statements given above is/are correct?
(a) A only (b) B only (c) Both A and B (d) Neither A nor B
17. Which one of the following is a steroid hormone?
(a) Calcitonin (b) Cortisol (c) Glucagon (d) Somatostatin
18. What is the role of oxygen in cellular respiration?
(a) It is the final electron acceptor in the respiratory chain
(b) It combines with glucose and oxidises it
(c) It clears lactic acid load
(d) It is utilized in the conversion step of AID? to ATP
19. Lactate produced by glycolysis in hypoxic muscle cells is transported via the blood to the liver. The lactose is convened to glucose and then released into the blood. What is this process called?
(a) HMP-Shunt (b) Cori cycle (c) Omithine cycle (d) Glucose-alanine cycle
20. Consider the following statements
A. The double bonds of polyunsaturated fatty acids are almost never conjugated but are separated by methylene group.
B. In nearly all naturally occurring unsaturated fatty acids.. The double bonds are in the cis configuration.
Which of the statements given above is/are correct?
(a) A only (b) B only (c) Both A and B (d) Neither A nor B
21. In the context of biological oxidation reduction reactions, consider the following enzymes:
A. Acyl Co-A dehydrogenase B. Glycerol 3-phosphate dehydrogenase
C. Succonate dehydrogenase
Which of the above enzymes employ flavin nucleotide coenzymes?
(a) A only (b) B and C only (c) C only (d) A, B and C
22. In the context of comparative study of excretionary system of vertebrates, which one of the following is a special device for water conservation in mammals?
(a) Bowman’s capsule (b) Proximal convoluted tubule
(c) Loop of Henle (d) Collecting duct
23.The movement of materials across the cell membrane with the help of
biological energy provided by ATP is called
(a) Active Transport. (b). Passive Transport. (c) Endocytosis. (d) Fractionation.
24.Which of the following names is appropriate for the sequence 5’ –G/ANNAUG -3’ in a mammalian mRNA ?
(a) Shine-Dalgarno sequence (b)Kozak sequence
(c) Internal ribosome entry sites (d) Translation termination site
25.Some important events in the history of life on Earth are given below :
A. First vertebrates (jawless fishes); first plants.
B. Forest of ferns and conifers; amphibians arise; insects radiate.
C. Conifers dominant; dinosaurs arise; insects radiate.
D. Flowering plants appear; climax of dinosaurs followed by extinction.
E. Radiation of flowering plants, most modern mammalian orders represented.
F. Ice Ages, Modern humans appear.
Match the above with the geological time periods and choose the correct combination.
(a) A – Silurian, B-Permian; C-Triassic; D-Jurassic; E-Cretaceous; F- Tertiary
(b) A-Ordovician; B- Carboniferous; C-Triassic; D-Cretaceous; E- Tertiary; F-Quaternary
(c) A-Cambrian; B-Ordovician; C-Silurian; D-Devonian; E-Permian ; F – Tertiary
(d) A-Devonian; B-Permian; C-Triassic; D-Cretaceous; E- Tertiary; F-Quaternary
26.A boy eats a large serving of cheese having high amount of sodium. He hardly drinks any fluid. Inspite of this, the water and electrolyte balance was maintained. Which one of the following explanation is correct ?
(a) His aldosterone was decreased and alcohol dehydrogenase (ADH) was increased
(b)His aldosterone was increased and ADH was decreased
(c)There was no change in either of the hormones
(d) His sympathoadrenal system was stimulated
27. During transgenesis, the location of the genes and their number integrated into the genome of the transgenic animal are random. It is often necessary to determine the copy number of genes and their tissue-specific transcription. The following are the possible methods used for the determination.
A. Polymerase Chain Reaction (PCR) B. Southern blot hybridization
C. Reverse Transcriptase PCR D. Western blot
Choose the correct set of combinations.
(a) A and B (b) B and C (c) B and D (d) A and D
28 From the following statements:
A. Triose phosphate is utilized for the synthesis of both starch and sucrose
B. Triose phosphate is translocated to cytosol from chloroplast
C. Triose phosphate is confined to chloroplast and is utilized for synthesis of starch only
D. Triose phosphate is translocated from cytosol to chloroplast
Which of the following combinations is correct regarding starch and sucrose synthesis during day time ?
(a) A and B (b) B and C (c) C and D (d) D and A
29. Restriction enzymes are enzymes
(a) capable of cutting DNA molecule
(b) capable of adding nucleotides to the 3’OH end
(c) capable of restricting protein synthesise
(d) capable of joining DNA molecules
30. Which of the following statements are true regarding restriction enzymes
(a) Type I and II enzymes cuts far away from the restriction sites
(b) Type II cuts DNA within restriction sites
(c) Eco R1 is a Type II restriction enzyme
(d) all of these
31) Which of the following statements are true regarding rDNA technology
(a) rDNA technology is used to obtain large number of copies of specific DNA fragments
(b) rDNA technology is used to obtain large quantities of the protein produced by the concerned gene
(c) rDNA technology is used to integrate gene of interest into chromosomes where it expresses itself
(d) all of these
32. Populations are said to be sympatric when _______.
(a) two populations are physically isolated by natural barriers.
(b) two populations live together and freely interbreed to produce sterile offspring.
(c) two populations share the same environment but cannot interbreed.
(d) two populations are isolated but occassionally come together to interbreed
33. Pollen grains of a plant whose 2n = 28 are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
(a) 21 (b) I4 (c) 56 (d) 28
34. Palaeontologists unearthed a human skull during excavation. A small fragment of the scalp tissue was still attached to it. Only little DNA could be extracted from it. lf the genes of the ancient man need to be analysed, the best way of getting sufficient amount of DNA from this extract is
(a) Subjecting the DNA to polymerase chain reaction
(b) Subjecting the DNA to gel electrophoresis
(c) Treating the DNA with restriction endonucleases
(d) Hybridising the DNA with a DNA probe
35.Blood stains are found at the site of a murder. lf DNA profiling technique is to be used for identifying the criminal, which of the following is ideal for use?
(a) Erythrocytes (b) Leucocytes (c) Platelets (d) Serum
36. Which one of the following is NOT the reason for very high load of bilirubin in a newborn?
(a) The liver of the newborn is too young to cope up with the heavy load of bilirubin.
(b) Excessive red blood corpuscles in the newborn burst, releasing the bilirubin.
(c) Insoluble bilirubin in the intestine is reabsorbed by the blood.
(d) Mother’s milk contains a high amount of bilirubin.
37. Which one of the following is NOT the function of insulin?
(a) Increase the oxidation of glucose in the cells.
(b) Increases the permeability of cell membrane to glucose.
(c) Initiates the formation of hepatic glycogen from excess of glucose.
(d) Initiates the conversion of glycogen to glucose.
38. Which one of the following is not related to guttation?
(a) Water is given out in the form of droplets
(b) Water given out is impure
(c) Water is given out during daytime
(d) none of the above
39. Which one of the following is NOT an antitranspirant?
(a) PMA (b) BAP (c) Silicon oil (d) Low viscosity
40. Which one of the following is not a second messenger in hormone action?
(a) Calcium (b) Sodium (c) cAMP (d) cGMP
41. Which one of the following is NOT a method of soil conservation?
(a) Overgrazing (b) Mulching (c) Crop rotation (d) Strip cropping
42. Which one of the following is mainly responsible for green house effect?
(a) SO2 (b) CO2 (c) CO (d) O2
43. Which one of the following is correct?
(a) Introns are present in m-RNA and exons are present in t-RNA
(b) Codons are present in m-RNA and anticodons in t-RNA
(c) Every intron is a set of three terminator codons
(d)Exons are present in eukaryotes while introns are present in prokaryotes
44. Which one of the following is an exotic carp species?
(a)Barbus stigma (b)Cyprinus carpio (c)Labeo bata (d) Cirrhinus mrigala
45. Which one of the following is an example of chlorophyllous thallophyte?
(a) Volvarialla (b) Spirogyra (c) Nephrolepis (d) Gnetum
46.To meet the demands of the society, in vitro production of a large number of plantlets in a short duration is practiced in floriculture and horticulture industry today. This is called _______.
(a) Soma clonal variation (b) Hybridoma technology
(c) Micropropagation (d) Somatic hybridization
47. The term genetic RNA refers to
(a) the RNA that carries genetic message
(b) the RNA that helps gene regulation in lac-operon
(c) the RNA present in mitochondria
(d) none of the above
48. When 2 to 3 drops of Benedicts reagent are added to a urine sample and heated gently, it turns yellow. This colour change indicates that ________.
(a) Urine contains 1.5% glucose
(b) Urine contains 2% glucose
(c) Urine contains 0.5th glucose
(d) Urine contains 1% glucose
49. What will be the codons in m-RNA if the DNA codes are ATG-CAG?
(a) TAC – GTC (b) UAC – GUC (c) UCA – TUA (d) TCA – GTC
50. What is/are true about heart wood?
A. It does not help in water conduction.
B. It is also called alburnum.
C. It is dark in colour but very soft.
D. It has tracheary elements which are filled with tannin, resin, etc.
(a) A and D (b) B and D (c) A, B and C (d) B. C and D
51. What is a genophore?
(a) DNA in prokaryotes (b) DNA and RNA in prokaryotes
(c) DNA and protein in prokaryotes (d) RNA in prokaryotes
52. Vitellogenesis occurs during the formation of
(a) Oogonial cell in the Graafian follicle
(b) Ootid in the fallopian tube
(c) Secondary Oocyte in the fallopian tube
(d) Primary oocyte in the Graafian follicle
53. Tyloses are found in _______.
(a) secondary xylem (b) secondary phloem (c) sclerenchyma fibres (d) sclereids
54. Transpiration facilitates
(a) Opening of stomata (b) Absorption of water by roots
(c) Excretion of minerals (d) Electrolyte balance
55. The World Intellectual Property Day is observed on ________.
(a) February, 29th (b) June, 30th (c) April, 26th (d) September, 5th
56. The types of ribosomes found in mitochondria are ________.
(a) 55 S (b) 38 S (c) 60 S (d) 39 S
57. The term, ‘southern blotting’ refers to
(a) transfer of DNA fragments from invitro cellulose membrane to electrophoresis gel
(b) attachment of probes to DNA fragments
(c) transfer of DNA fragments from electrophoresis gel to nitrocellulose sheet.
(d) comparison of DNA fragments from two sources
58.The sugar present in milk is _______.
(a) Sucrose (b) Fructose (c) Lactose (d) Glucose
59. The space between the plasma membrane and the cell wall of a plasmolyzed cell surrounded by a hypertonic solution is occupied by the
(a) hypotonic solution (b) isotonic solution (c) hypertonic solution (d) water
60. The single horned Rhinoceros is protected at _______.
(a) Kaziranga National Park (b) Kahna National Park
(c) Rajiv Gandhi National Park (d) Anashi National Park
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