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Delhi University Entrance Test (DUET) 2020 Previous Year Question Paper With Answer Key

DU MSc Microbiology
Topic: MICRO MSC S2
1) The virus which was used in the HersheyChase experiment to prove that DNA is the genetic material, belong to the
genus:
[Question ID = 3392]
1. T1 virus [Option ID = 13562]
2. T2 virus [Option ID = 13563]
3. T3 virus [Option ID = 13564]
4. T4 virus [Option ID = 13565]
Correct Answer :
T4 virus [Option ID = 13565]
2) High partition coefficient during the liquidliquid extraction process for product recovery implicates:
[Question ID = 3393]
1. Difficulty in the extraction process [Option ID = 13566]
2. Higher product degradation [Option ID = 13567]
3. No effect on the extraction process [Option ID = 13568]
4. Ease of extraction [Option ID = 13569]
Correct Answer :
Ease of extraction [Option ID = 13569]
3) Numerical aperture of an oil immersion objective lens is around:
[Question ID = 3394]
1. 0.65 [Option ID = 13570]
2. 0.85 [Option ID = 13571]
3. 1.33 [Option ID = 13572]
4. 1.03 [Option ID = 13573]
Correct Answer :
1.33 [Option ID = 13572]
4) Which one of the following statements is incorrect?
[Question ID = 3395]
1. RNA polymerase III uses internal promoters located within the transcription unit [Option ID = 13574]
2. RNA polymerase II synthesizes mRNAs [Option ID = 13575]
3. RNA polymerase I synthesizes tRNAs [Option ID = 13576]
4. RNA polymerase III synthesizes small RNAs [Option ID = 13577]
Correct Answer :
RNA polymerase I synthesizes tRNAs [Option ID = 13576]
5) An icosahedron structure of virus particle is made of:
[Question ID = 3396]
1. 20 vertices, 12 edges, 30 faces [Option ID = 13578]
2. 20 edges, 12 faces, 30 vertices [Option ID = 13579]
3. 20 faces, 12 vertices, 30 edges [Option ID = 13580]
4. 20 vertices, 12 faces, 30 edges [Option ID = 13581]
Correct Answer :
20 faces, 12 vertices, 30 edges [Option ID = 13580]
6) A nucleotide consists of a nitrogenous base linked to a sugarphosphate. The nitrogenous base is either a purine or a
pyramidine. Which of the following combinations are pyramidines?
[Question ID = 3397]
1. Thymine and adenine [Option ID = 13582]
2. Cytosine and guanine [Option ID = 13583]
3. Guanine and adenine [Option ID = 13584]
4. Cytosine and uracil [Option ID = 13585]
Correct Answer :
Cytosine and uracil [Option ID = 13585]
7) Which of the following enzymes is generally used in the preparation of HighFructose Corn Syrup (HFCS)?
[Question ID = 3398]
1. Glucose oxidase [Option ID = 13586]
2. Glucose isomerase [Option ID = 13587]

---

3. Glucose dehydrogenase [Option ID = 13588]
4. Aldose reductase [Option ID = 13589]
Correct Answer :
Glucose isomerase [Option ID = 13587]
8) Cyclization of glucose results in a:
[Question ID = 3399]
1. Furanose ring [Option ID = 13590]
2. Pyranose ring [Option ID = 13591]
3. Glycosyl ring [Option ID = 13592]
4. Glycone ring [Option ID = 13593]
Correct Answer :
Pyranose ring [Option ID = 13591]
9) During assembly of a Poliovirus particle, twelve of the 14 S complexes assemble together to form:
[Question ID = 3400]
1. an empty 73 S capsid [Option ID = 13594]
2. an empty 125 S capsid [Option ID = 13595]
3. 73 S capsid packaged with positive ssRNA genome inside it [Option ID = 13596]
4. 125 S capsid packaged with negative ssRNA genome inside it [Option ID = 13597]
Correct Answer :
an empty 73 S capsid [Option ID = 13594]
10) Resolving power of a microscope is a function of:
[Question ID = 3401]
1. Only wavelength of light used [Option ID = 13598]
2. Only numerical aperture of lens system [Option ID = 13599]
3. Refractive index [Option ID = 13600]
4. Wavelength of light used and numerical aperture of lens system [Option ID = 13601]
Correct Answer :
Wavelength of light used and numerical aperture of lens system [Option ID = 13601]
11) Which of the following is not an industrial byproduct?
[Question ID = 3402]
1. Sulfite waste liquor [Option ID = 13602]
2. Corn steep liquor [Option ID = 13603]
3. Molasses [Option ID = 13604]
4. Yeast hydrolysate [Option ID = 13605]
Correct Answer :
Yeast hydrolysate [Option ID = 13605]
12) A male genetic disorder caused by the presence of one or more extra X chromosomes is:
[Question ID = 3403]
1. Huntington's disease [Option ID = 13606]
2. Klinefelter syndrome [Option ID = 13607]
3. CreutzfeldtJakob disease [Option ID = 13608]
4. Alzheimer's disease [Option ID = 13609]
Correct Answer :
Klinefelter syndrome [Option ID = 13607]
13) Which one of these enzymes is not packaged inside a retrovirus particle?
[Question ID = 3404]
1. RNA dependent DNA polymerase [Option ID = 13610]
2. Integrase [Option ID = 13611]
3. Protease [Option ID = 13612]
4. Glycosylase [Option ID = 13613]
Correct Answer :
Glycosylase [Option ID = 13613]
14) Who was awarded Nobel Prize for the discovery of streptomycin?
[Question ID = 3405]
1. Selman A. Waksman [Option ID = 13614]
2. Paul Ehrlich [Option ID = 13615]
3. Elie Metchnikoff [Option ID = 13616]
4. Sergei N. Winogradsky [Option ID = 13617]
Correct Answer :
Selman A. Waksman [Option ID = 13614]

---

15) Which of the following groups of microorganisms contribute maximally to global antibiotic production?
[Question ID = 3406]
1. Firmicutes [Option ID = 13618]
2. Proteobacteria [Option ID = 13619]
3. Halobacteria [Option ID = 13620]
4. Actinobacteria [Option ID = 13621]
Correct Answer :
Actinobacteria [Option ID = 13621]
16) Representatives of most major families of DNA viruses are associated with cancer, except:
[Question ID = 3407]
1. Poxviruses [Option ID = 13622]
2. Adenoviruses [Option ID = 13623]
3. Herpesviruses [Option ID = 13624]
4. Polyomaviruses [Option ID = 13625]
Correct Answer :
Poxviruses [Option ID = 13622]
17) Which of the following could be the reason for no expression of eukaryotic recombinant protein using an expression
vector in E.coli?
[Question ID = 3408]
1. Addition of inducing agent
[Option ID = 13626]
2. Growth of bacterial culture in presence of the antibiotic used to select for the recombinant plasmid
[Option ID = 13627]
3. Codon bias
[Option ID = 13628]
4. Eukaryotic proteins cannot ever be expressed in bacteria
[Option ID = 13629]
Correct Answer :
Codon bias
[Option ID = 13628]
18) The region in which bacteriochlorophyll can absorb light is:
[Question ID = 3409]
1. ultraviolet region [Option ID = 13630]
2. infrared region [Option ID = 13631]
3. visible region [Option ID = 13632]
4. short wavelength of visible range [Option ID = 13633]
Correct Answer :
infrared region [Option ID = 13631]
19) Ribavirin has been used in aerosol form to treat infants hospitalized with:
[Question ID = 3410]
1. Lassa fever [Option ID = 13634]
2. Respiratory syncytial virus infection [Option ID = 13635]
3. Bunyavirus infection [Option ID = 13636]
4. Hepatitis C virus infection [Option ID = 13637]
Correct Answer :
Respiratory syncytial virus infection [Option ID = 13635]
20) Introduction of oxygen into fermenting yeast leads to the cessation of ethanol fermentation, which is known as:
[Question ID = 3411]
1. HardenYoung effect [Option ID = 13638]
2. Pasteur effect [Option ID = 13639]
3. Crabtree effect [Option ID = 13640]
4. Winogradsky effect [Option ID = 13641]
Correct Answer :
Pasteur effect [Option ID = 13639]
21) Thermolabile biological material cannot be extracted from fermentation broth by use of which of the following
techniques?
[Question ID = 3412]
1. Lyophilization [Option ID = 13642]

---

2. Sublimation [Option ID = 13643]
3. Spray drying [Option ID = 13644]
4. SolventSolvent extraction [Option ID = 13645]
Correct Answer :
Sublimation [Option ID = 13643]
22) The alphahelix configuration found in proteins has:
[Question ID = 3413]
1. 3.4 amino acids per turn [Option ID = 13646]
2. 2 amino acids per turn [Option ID = 13647]
3. 4 amino acids per turn [Option ID = 13648]
4. 3.6 amino acids per turn [Option ID = 13649]
Correct Answer :
3.6 amino acids per turn [Option ID = 13649]
23) Traditionally Koumiss is made from the milk of which of the following animals?
[Question ID = 3414]
1. Mare [Option ID = 13650]
2. Cow [Option ID = 13651]
3. Buffalo [Option ID = 13652]
4. Goat [Option ID = 13653]
Correct Answer :
Mare [Option ID = 13650]
24) In which of the following cases can a vaccine be used postexposure to the virus?
[Question ID = 3415]
1. Hepatitis C virus [Option ID = 13654]
2. Rabies virus [Option ID = 13655]
3. Epstein Barr Virus [Option ID = 13656]
4. Poliovirus [Option ID = 13657]
Correct Answer :
Rabies virus [Option ID = 13655]
25) Which of the following combinations regulate gene expression?
[Question ID = 3416]
1. Promoter strength and DNA polymerase activity [Option ID = 13658]
2. Origin strength and DNA helicase activity [Option ID = 13659]
3. Histone acetylation and replisome stability [Option ID = 13660]
4. DNA methylation and mRNA stability [Option ID = 13661]
Correct Answer :
DNA methylation and mRNA stability [Option ID = 13661]
26) Which of the following microorganisms are used in yogurt preparation (1:1 ratio)?
[Question ID = 3417]
1. Lactobacillus delbrueckii and Streptococcus thermophilus
[Option ID = 13662]
2. Streptococcus thermophilus and Lactobacillus lactis
[Option ID = 13663]
3. Lactobacillus delbrueckii and Lactobacillus casei
[Option ID = 13664]
4. Lactobacillus delbrueckii and Lactobacillus lactis
[Option ID = 13665]
Correct Answer :
Lactobacillus delbrueckii and Streptococcus thermophilus
[Option ID = 13662]
27) In 1952, this scientist published a paper that established the plaque assay as a means of counting viable animal viruses:
[Question ID = 3418]
1. John Enders [Option ID = 13666]
2. Frederick Robbins [Option ID = 13667]
3. Renato Dulbecco [Option ID = 13668]
4. James Watson [Option ID = 13669]
Correct Answer :
Renato Dulbecco [Option ID = 13668]

---

28) In specialized transduction using lambda phage:
[Question ID = 3419]
1. Only the gal or bio regions can get transduced
[Option ID = 13670]
2. Any region of the host can be transduced
[Option ID = 13671]
3. The transducing particle is able to propagate itself subsequently
[Option ID = 13672]
4. The transducing particle carries only host DNA
[Option ID = 13673]
Correct Answer :
Only the gal or bio regions can get transduced
[Option ID = 13670]
29) Anoxygenic bacterial photosynthesis uses the following as a chemical reductant:
[Question ID = 3420]
1. oxygen [Option ID = 13674]
2. water [Option ID = 13675]
3. hydrogen sulphide [Option ID = 13676]
4. ammonia [Option ID = 13677]
Correct Answer :
hydrogen sulphide [Option ID = 13676]
30) The concept of `gene rearrangement in antibody production' was given by:
[Question ID = 3421]
1. Cesar Milstein [Option ID = 13678]
2. Susumu Tonegawa [Option ID = 13679]
3. Gerald Edelman [Option ID = 13680]
4. Peter Doherty [Option ID = 13681]
Correct Answer :
Susumu Tonegawa [Option ID = 13679]
31) Which of the following is an essential fatty acid?
[Question ID = 3422]
1. Oleic Acid [Option ID = 13682]
2. Lauric Acid [Option ID = 13683]
3. Alpha linolenic Acid [Option ID = 13684]
4. Palmitic Acid [Option ID = 13685]
Correct Answer :
Alpha linolenic Acid [Option ID = 13684]
32) During food preservation, sodium nitrate is an effective agent against which of the following microorganisms under
acidic conditions?
[Question ID = 3423]
1. Anaerobic microorganisms [Option ID = 13686]
2. Aerobic microorganisms [Option ID = 13687]
3. Acidophiles [Option ID = 13688]
4. Thermophiles [Option ID = 13689]
Correct Answer :
Anaerobic microorganisms [Option ID = 13686]
33) In birds, the lymphoid organ which is the primary site of Bcell maturation is:
[Question ID = 3424]
1. Bone marrow [Option ID = 13690]
2. Bursa of fabricius [Option ID = 13691]
3. Harderian gland [Option ID = 13692]
4. Germinal center [Option ID = 13693]
Correct Answer :
Bursa of fabricius [Option ID = 13691]
34) Which of the following would you use to determine if a mutation in a DNAbinding protein results in loss of DNAbinding
function?
[Question ID = 3425]
1. Mass spectrometry [Option ID = 13694]

---

2. SDSPAGE [Option ID = 13695]
3. Southern blotting [Option ID = 13696]
4. Electrophoretic mobility shift assay [Option ID = 13697]
Correct Answer :
Electrophoretic mobility shift assay [Option ID = 13697]
35) In general, the substances with molecular mass lower than this are poorly immunogenic
[Question ID = 3426]
1. 80100 kDa [Option ID = 13698]
2. 3050 kDa [Option ID = 13699]
3. 510 kDa [Option ID = 13700]
4. 1 kDa [Option ID = 13701]
Correct Answer :
510 kDa [Option ID = 13700]
36) A competitive inhibitor of an enzyme:
[Question ID = 3427]
1. decreases Km without affecting Vmax [Option ID = 13702]
2. decreases Vmax without affecting Km [Option ID = 13703]
3. increases Vmax without affecting Km [Option ID = 13704]
4. increases Km without affecting Vmax [Option ID = 13705]
Correct Answer :
increases Km without affecting Vmax [Option ID = 13705]
37) The monoclonal antibodies that catalyze reactions are:
[Question ID = 3428]
1. Single chain antibodies [Option ID = 13706]
2. Single domain antibodies [Option ID = 13707]
3. Nanobodies [Option ID = 13708]
4. Abzymes [Option ID = 13709]
Correct Answer :
Abzymes [Option ID = 13709]
38) When radiolabelling DNA to make probes for Southern blotting you would use:
[Question ID = 3429]
1. RNA polymerase I [Option ID = 13710]
2. DNA polymerase I [Option ID = 13711]
3. Mung bean nuclease [Option ID = 13712]
4. Exonuclease III [Option ID = 13713]
Correct Answer :
DNA polymerase I [Option ID = 13711]
39) Chlorobium belongs to the following group of photosynthetic bacteria:
[Question ID = 3430]
1. Purple sulphur bacteria
[Option ID = 13714]
2. Green sulphur bacteria
[Option ID = 13715]
3. Purple nonsulphur bacteria
[Option ID = 13716]
4. Green nonsulphur bacteria
[Option ID = 13717]
Correct Answer :
Green sulphur bacteria
[Option ID = 13715]
40) Class III MHC genes encode:
[Question ID = 3431]
1. Glycoproteins expressed primarily on antigen presenting cells [Option ID = 13718]
2. Glycoproteins expressed on surface of nearly all nucleated cells [Option ID = 13719]
3. Various secreted proteins that have immune functions like component of complement system [Option ID = 13720]
4. Proteins involved in mucosal immunity [Option ID = 13721]
Correct Answer :
Various secreted proteins that have immune functions like component of complement system [Option ID = 13720]

---

41) Phytase enzyme helps in the solubilization of:
[Question ID = 3432]
1. Inorganic sulfur from phytic acid [Option ID = 13722]
2. Inorganic nitrogen from phytic acid [Option ID = 13723]
3. Inorganic phosphorus from phytic acid [Option ID = 13724]
4. Inorganic arsenic from phytic acid [Option ID = 13725]
Correct Answer :
Inorganic phosphorus from phytic acid [Option ID = 13724]
42) The organisms which can use reduced inorganic compounds as electron donors are known as:
[Question ID = 3433]
1. chemotrophs [Option ID = 13726]
2. organotrophs [Option ID = 13727]
3. lithotrophs [Option ID = 13728]
4. phototrophs [Option ID = 13729]
Correct Answer :
lithotrophs [Option ID = 13728]
43) The complement system components that make `membrane attack complex' are:
[Question ID = 3434]
1. C4b, C4c, C4d and C5a [Option ID = 13730]
2. C5, C6, C7, C8 and C9 [Option ID = 13731]
3. C5a, C6, C7, C8 and C9 [Option ID = 13732]
4. C5b, C6, C7, C8 and C9 [Option ID = 13733]
Correct Answer :
C5b, C6, C7, C8 and C9 [Option ID = 13733]
44) Rumen anaerobic fungi exist in relationship with _________to increase the rate of cellulose breakdown in animals.
[Question ID = 3435]
1. Acetogens [Option ID = 13734]
2. Alkaliphiles [Option ID = 13735]
3. Acidophiles [Option ID = 13736]
4. Methanogens [Option ID = 13737]
Correct Answer :
Methanogens [Option ID = 13737]
45) ChediakHigashi syndrome is a rare inherited disorder which is characterized by abnormal function of which type of
cells of the immune system?
[Question ID = 3436]
1. Bcells [Option ID = 13738]
2. Tcells [Option ID = 13739]
3. Natural killer cells [Option ID = 13740]
4. Cytotoxic T cells [Option ID = 13741]
Correct Answer :
Natural killer cells [Option ID = 13740]
46) Which of the following is not essential for the survival and propagation of a eukaryotic chromosome?
[Question ID = 3437]
1. Origin [Option ID = 13742]
2. Centromere [Option ID = 13743]
3. Promoter [Option ID = 13744]
4. Telomere [Option ID = 13745]
Correct Answer :
Promoter [Option ID = 13744]
47) In respirometry, the evolution of labelled CO from which carbon of glucose represents operation of Entner Doudoroff
2
pathway?
[Question ID = 3438]
1. C1 and C2 [Option ID = 13746]
2. C2 and C5 [Option ID = 13747]
3. C1 and C4 [Option ID = 13748]
4. C3 and C4 [Option ID = 13749]
Correct Answer :
C1 and C4 [Option ID = 13748]
48) The Bacillus sporulation cascade is controlled by:

---

[Question ID = 3439]
1. Alternative RNA polymerases
[Option ID = 13750]
2. Alternative sigma factors
[Option ID = 13751]
3. Antiterminators
[Option ID = 13752]
4. Transcriptional repressors
[Option ID = 13753]
Correct Answer :
Alternative sigma factors
[Option ID = 13751]
49) The transfer of tissue between genetically different members of the same species is termed as:
[Question ID = 3440]
1. Autograft [Option ID = 13754]
2. Isograft [Option ID = 13755]
3. Allograft [Option ID = 13756]
4. Xenograft [Option ID = 13757]
Correct Answer :
Allograft [Option ID = 13756]
50) Under standard conditions, when all reactants and products are at 1 mol/L concentration, then:
[Question ID = 3441]
1. G = 0 [Option ID = 13758]
2. Go = 0 [Option ID = 13759]
3. G = Go [Option ID = 13760]
4. Keq = 1 [Option ID = 13761]
Correct Answer :
G = Go [Option ID = 13760]
51) If the doubling time of a microorganism is 40 minutes, what is its specific growth rate?
[Question ID = 3442]
1. 40 min
1 [Option ID = 13762]
2. 46.2 min1 [Option ID = 13763]
3. 1.0395 h1 [Option ID = 13764]
4. 1.0895 h1 [Option ID = 13765]
Correct Answer :
1.0395 h1 [Option ID = 13764]
52) Which of these is a cancer prevention vaccine approved for use in humans?
[Question ID = 3443]
1. Gardasil [Option ID = 13766]
2. Havrix [Option ID = 13767]
3. Menveo [Option ID = 13768]
4. Shingrix [Option ID = 13769]
Correct Answer :
Gardasil [Option ID = 13766]
53) An extracellular matrix fibrous protein found in basal laminae is:
[Question ID = 3444]
1. Fibronectin [Option ID = 13770]
2. Integrin [Option ID = 13771]
3. Entactin [Option ID = 13772]
4. Laminin [Option ID = 13773]
Correct Answer :
Laminin [Option ID = 13773]
54) One of the following is a continuous culture method:
[Question ID = 3445]
1. Chemostat [Option ID = 13774]
2. Hemostat [Option ID = 13775]
3. CoulterCounter [Option ID = 13776]
4. Turbidostat [Option ID = 13777]
Correct Answer :

---

Chemostat [Option ID = 13774]
55) Which one of these is part of the normal microflora of human skin?
[Question ID = 3446]
1. Staphylococcus aureus
[Option ID = 13778]
2. Escherichia coli
[Option ID = 13779]
3. Lactobacillus sp.
[Option ID = 13780]
4. Haemophilus parainfluenzae
[Option ID = 13781]
Correct Answer :
Staphylococcus aureus
[Option ID = 13778]
56) Brandy is made by distilling of:
[Question ID = 3447]
1. Beer [Option ID = 13782]
2. Wine [Option ID = 13783]
3. Rum [Option ID = 13784]
4. Whisky [Option ID = 13785]
Correct Answer :
Wine [Option ID = 13783]
57) In ELISA, incubating a plate with antigen or antibody is known as:
[Question ID = 3448]
1. Blocking [Option ID = 13786]
2. Coating [Option ID = 13787]
3. Sandwiching [Option ID = 13788]
4. Detection [Option ID = 13789]
Correct Answer :
Coating [Option ID = 13787]
58) Which of the following is not used in the preservation of food?
[Question ID = 3449]
1. Salt [Option ID = 13790]
2. Sugar [Option ID = 13791]
3. Organic Acids [Option ID = 13792]
4. Mineral Acids [Option ID = 13793]
Correct Answer :
Mineral Acids [Option ID = 13793]
59) The capsules of bacteria can act as virulence factors because they can:
[Question ID = 3450]
1. Interfere with antibody binding [Option ID = 13794]
2. Interfere with phagocytosis [Option ID = 13795]
3. Interfere with B cell activation [Option ID = 13796]
4. Interfere with activity of interferons [Option ID = 13797]
Correct Answer :
Interfere with phagocytosis [Option ID = 13795]
60) Which of the following statements is true?
[Question ID = 3451]
1. The Mu phage is a transposon [Option ID = 13798]
2. The lambda phage is a virulent phage [Option ID = 13799]
3. The T4 phage is a temperate phage [Option ID = 13800]
4. M13 is an icosahedral phage [Option ID = 13801]
Correct Answer :
The Mu phage is a transposon [Option ID = 13798]
61) Conversion of 1 mole of glucose to 2 mole lactate under anaerobic conditions results in:
[Question ID = 3452]
1. Gain of 2 mole NADH and 2 mole of ATP [Option ID = 13802]
2. Generation of 2 mole ATP [Option ID = 13803]

---

3. Generation of 1 mole ATP [Option ID = 13804]
4. Gain of 2 mole of NADH [Option ID = 13805]
Correct Answer :
Generation of 2 mole ATP [Option ID = 13803]
62) For how long can anthrax spores survive in a dry soil?
[Question ID = 3453]
1. 3040 days [Option ID = 13806]
2. 67 months [Option ID = 13807]
3. 67 years [Option ID = 13808]
4. More than 50 years [Option ID = 13809]
Correct Answer :
More than 50 years [Option ID = 13809]
63) Which of the following mutations would make the lac operon constitutive?
[Question ID = 3454]
1. lacO
[Option ID = 13810]
2. lacIs
[Option ID = 13811]
3. lacZ
[Option ID = 13812]
4. lacY
[Option ID = 13813]
Correct Answer :
lacO
[Option ID = 13810]
64) Which of the following traits permits a bacterium to act as a donor during conjugation?
[Question ID = 3455]
1. Presence of Col plasmid [Option ID = 13814]
2. Presence of R plasmid [Option ID = 13815]
3. Presence of F plasmid [Option ID = 13816]
4. Presence of 2 micron plasmid [Option ID = 13817]
Correct Answer :
Presence of F plasmid [Option ID = 13816]
65) All of the following drugs are cell wall biosynthesis inhibitors, except:
[Question ID = 3456]
1. Fosfomycin [Option ID = 13818]
2. Bacitracin [Option ID = 13819]
3. Gramicidin [Option ID = 13820]
4. Penicillin [Option ID = 13821]
Correct Answer :
Gramicidin [Option ID = 13820]
66) NAG and NAM of peptidoglycan layer is linked by:
[Question ID = 3457]
1. beta(1,4) glycosidic linkage [Option ID = 13822]
2. alpha(1,4) glycosidic linkage [Option ID = 13823]
3. alpha(1,6) glycosidic linkage [Option ID = 13824]
4. beta(1,6) glycosidic linkage [Option ID = 13825]
Correct Answer :
beta(1,4) glycosidic linkage [Option ID = 13822]
67) Polyphenol oxidases help in the degradation of:
[Question ID = 3458]
1. Cellulose [Option ID = 13826]
2. Hemicellulose [Option ID = 13827]
3. Lignin [Option ID = 13828]
4. Lipid bilayer [Option ID = 13829]
Correct Answer :
Lignin [Option ID = 13828]

---

68) Of those infected with Polio virus, what percentage of children show symptoms of infection?
[Question ID = 3459]
1. 10% [Option ID = 13830]
2. 50% [Option ID = 13831]
3. 90% [Option ID = 13832]
4. 100% [Option ID = 13833]
Correct Answer :
10% [Option ID = 13830]
69) Agrobacterium is able to facilitate transformation in plants because:
[Question ID = 3460]
1. Its Ti plasmid facilitates DNA transfer into the plant cell [Option ID = 13834]
2. The bacterium is able to enter into the plant and travel to the shoot tip [Option ID = 13835]
3. It triggers pollination [Option ID = 13836]
4. It feeds on the plant [Option ID = 13837]
Correct Answer :
Its Ti plasmid facilitates DNA transfer into the plant cell [Option ID = 13834]
70) Which one of the following represents a group of prokaryotes that lack cell wall?
[Question ID = 3461]
1. Gracilicutes [Option ID = 13838]
2. Firmicutes [Option ID = 13839]
3. Tenericutes [Option ID = 13840]
4. Mendosicutes [Option ID = 13841]
Correct Answer :
Tenericutes [Option ID = 13840]
71) Which of these is not a term for a form of leishmaniasis?
[Question ID = 3462]
1. Kala azar [Option ID = 13842]
2. Dumdum fever [Option ID = 13843]
3. Baghdad boil [Option ID = 13844]
4. Kali gham [Option ID = 13845]
Correct Answer :
Kali gham [Option ID = 13845]
72) Which of the following antibiotics inhibits peptidyl transferase activity?
[Question ID = 3463]
1. Cycloheximide [Option ID = 13846]
2. Kanamycin [Option ID = 13847]
3. Tetracycline [Option ID = 13848]
4. Paromomycin [Option ID = 13849]
Correct Answer :
Cycloheximide [Option ID = 13846]
73) A protein's size was found to be 150 kDa by gel filtration. When it was resolved on SDSPAGE, two bands of equal
intensity of sizes 50 kDa and 25 kDa were seen. Which of the following is the most likely conclusion you would draw?
[Question ID = 3464]
1. The protein was completely degraded during SDSPAGE [Option ID = 13850]
2. The protein got aggregated during gel filtration [Option ID = 13851]
3. The protein is a heterodimer of two subunits of sizes 50 kDa and 25 kDa [Option ID = 13852]
4. The protein is a heterotetramer of two subunit types of sizes 50 kDa and 25 kDa. [Option ID = 13853]
Correct Answer :
The protein is a heterotetramer of two subunit types of sizes 50 kDa and 25 kDa. [Option ID = 13853]
74) Diauxic growth curve of E. coli on glucose lactose broth is best explained as follows:
[Question ID = 3465]
1. E.coli uses glucose and lactose with different rates
[Option ID = 13854]
2. Utilization of complex sugar is delayed as it is under catabolite repression by glucose
[Option ID = 13855]
3. Growth pattern of bacterium always changes from sigmoidal to diauxic in presence of mixture of sugars
[Option ID = 13856]
4. One of the two sugars is used first before the second sugar is utilized
[Option ID = 13857]

---

Correct Answer :
Utilization of complex sugar is delayed as it is under catabolite repression by glucose
[Option ID = 13855]
75) The enzyme that is responsible for the negative supercoiling of prokaryotic chromosomes is:
[Question ID = 3466]
1. DNA topoisomerase I [Option ID = 13858]
2. DNA topoisomerase II [Option ID = 13859]
3. DNA gyrase [Option ID = 13860]
4. DNA B helicase [Option ID = 13861]
Correct Answer :
DNA gyrase [Option ID = 13860]
76) Pisatin detoxification in pea plant by Nectria hematococca is due to the production of:
[Question ID = 3467]
1. Pisatin demethylase
[Option ID = 13862]
2. Pisatin hydrolase
[Option ID = 13863]
3. Pisatin carboxylase
[Option ID = 13864]
4. Pisatin deaminase
[Option ID = 13865]
Correct Answer :
Pisatin demethylase
[Option ID = 13862]
77) Which of the following is not a characteristic of histoplasmosis?
[Question ID = 3468]
1. Person to person transmission [Option ID = 13866]
2. Specific geographic distribution [Option ID = 13867]
3. Yeasts in tissue [Option ID = 13868]
4. Mycelial phase in the soil [Option ID = 13869]
Correct Answer :
Person to person transmission [Option ID = 13866]
78) The process of sequencing the human genome in short pieces and then assembling the pieces together into the whole
genome sequence by overlapping reads is called:
[Question ID = 3469]
1. Chromosome walking [Option ID = 13870]
2. Shotgun sequencing [Option ID = 13871]
3. Primer walking [Option ID = 13872]
4. Chromosome jumping [Option ID = 13873]
Correct Answer :
Shotgun sequencing [Option ID = 13871]
79) Which one of the following processes does not generate ATP?
[Question ID = 3470]
1. Oxidative phosphorylation [Option ID = 13874]
2. CalvinBenson cycle [Option ID = 13875]
3. Photophosphorylation [Option ID = 13876]
4. Substratelevel phosphorylation [Option ID = 13877]
Correct Answer :
CalvinBenson cycle [Option ID = 13875]
80) Multi drug resistant (MDR) TB is caused by strains of M. tuberculosis that are resistant to:
[Question ID = 3471]
1. Rifampicin or Isoniazid [Option ID = 13878]
2. Rifampicin and Isoniazid [Option ID = 13879]
3. Rifampicin, Isoniazid and at least one injectable agent [Option ID = 13880]
4. Rifampicin, Isoniazid and at least one of the fluoroquinolones [Option ID = 13881]
Correct Answer :
Rifampicin and Isoniazid [Option ID = 13879]

---

81) In aquatic bodies hydrostatic pressure increases by 0.25 atm for every 10 m increase in depth. The hydrostatic
pressure at 1000 m depth is expected to be:
[Question ID = 3472]
1. 24 atm [Option ID = 13882]
2. 25 atm [Option ID = 13883]
3. 26 atm [Option ID = 13884]
4. 27 atm [Option ID = 13885]
Correct Answer :
26 atm [Option ID = 13884]
82) Winogradsky column is often used for the isolation of:
[Question ID = 3473]
1. Desulfovibrio spp.
[Option ID = 13886]
2. Sulfolobus spp.
[Option ID = 13887]
3. Escherichia spp.
[Option ID = 13888]
4. Pyrolobus spp
[Option ID = 13889]
Correct Answer :
Desulfovibrio spp.
[Option ID = 13886]
83) The regulation of bacterial operons by transcriptional termination events before the first structural gene of the operon
is called:
[Question ID = 3474]
1. Catabolite repression [Option ID = 13890]
2. Stringent response [Option ID = 13891]
3. Attenuation [Option ID = 13892]
4. Induction [Option ID = 13893]
Correct Answer :
Attenuation [Option ID = 13892]
84) Teichoic acid present in cell wall of Grampositive bacteria binds to
[Question ID = 3475]
1. Ferrous ions [Option ID = 13894]
2. Phosphorus ions [Option ID = 13895]
3. Magnesium ions [Option ID = 13896]
4. Sulphur ions [Option ID = 13897]
Correct Answer :
Magnesium ions [Option ID = 13896]
85) Which of the following represents a washout condition in an ideal continuous stirredtank reactor (CSTR)?
[Question ID = 3476]
1. ? > D [Option ID = 13898]
2. ? = D [Option ID = 13899]
3. ? < D [Option ID = 13900]
4. There is no relation between ? and D [Option ID = 13901]
Correct Answer :
? < D [Option ID = 13900]
86) The cellular organelle with acid hyrolases within its lumen is:
[Question ID = 3477]
1. Mitochondrion [Option ID = 13902]
2. Lysosome [Option ID = 13903]
3. Peroxisome [Option ID = 13904]
4. Endoplasmic reticulum [Option ID = 13905]
Correct Answer :
Lysosome [Option ID = 13903]
87) Which amino acid forms the peptide interbridge between two peptidoglycan moieties in the cell wall of Staphylococcus
aureus?

---

[Question ID = 3478]
1. L Glycine
[Option ID = 13906]
2. L Alanine
[Option ID = 13907]
3. L Serine
[Option ID = 13908]
4. D Lysine
[Option ID = 13909]
Correct Answer :
L Glycine
[Option ID = 13906]
88) In the disease triangle, which of the following factors is not involved?
[Question ID = 3479]
1. Susceptible host [Option ID = 13910]
2. Pathogen [Option ID = 13911]
3. Conducive environment [Option ID = 13912]
4. Duration of exposure time [Option ID = 13913]
Correct Answer :
Duration of exposure time [Option ID = 13913]
89) The human cell has 23 pairs of chromosomes. After meiosis, the number of chromatids in the cell would be:
[Question ID = 3480]
1. 72 [Option ID = 13914]
2. 23 [Option ID = 13915]
3. 92 [Option ID = 13916]
4. 46 [Option ID = 13917]
Correct Answer :
46 [Option ID = 13917]
90) Which of the following statements is most appropriate?
[Question ID = 3481]
1. EMB agar is a differential medium only [Option ID = 13918]
2. MacConkey agar is both selective and differential medium [Option ID = 13919]
3. EMB agar is both selective and differential medium for Gram positive bacteria [Option ID = 13920]
4. MacConkey agar is a selective medium only [Option ID = 13921]
Correct Answer :
MacConkey agar is both selective and differential medium [Option ID = 13919]
91) Polyetic pathogens are those pathogens which can:
[Question ID = 3482]
1. Complete a life cycle in 15 days [Option ID = 13922]
2. Complete a life cycle in one month [Option ID = 13923]
3. Complete a life cycle in two months [Option ID = 13924]
4. Complete a life cycle in an entire year or more than a year [Option ID = 13925]
Correct Answer :
Complete a life cycle in an entire year or more than a year [Option ID = 13925]
92) Which of the following statements is true with reference to Type I restriction enzymes?
[Question ID = 3483]
1. Require only ATP for cleavage [Option ID = 13926]
2. Recognize bipartite sequences [Option ID = 13927]
3. Cleave DNA at their recognition site [Option ID = 13928]
4. Methylate DNA only at cytosine residues [Option ID = 13929]
Correct Answer :
Recognize bipartite sequences [Option ID = 13927]
93) Which of the following is mismatched?
[Question ID = 3484]
1. Facultative gram ?ve rods : E.coli
[Option ID = 13930]
2. TSI test negative : Pseudomonas
[Option ID = 13931]

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3. Anaerobic gram +ve spore former : Bacillus
[Option ID = 13932]
4. Pleomorphic gram +ve rods : Corynebacterium
[Option ID = 13933]
Correct Answer :
Anaerobic gram +ve spore former : Bacillus
[Option ID = 13932]
94) The active ingredient of Galltrol, a commercial biocontrol agent is:
[Question ID = 3485]
1. Agrobacterium tumefaciens
[Option ID = 13934]
2. Agrobacterium radiobacter strain K84
[Option ID = 13935]
3. Trichoderma harzianum
[Option ID = 13936]
4. Trichoderma viridae
[Option ID = 13937]
Correct Answer :
Agrobacterium radiobacter strain K84
[Option ID = 13935]
95) After knocking out a gene, when trying to study the effect of the knockout on genomewide gene expression you
would resort to:
[Question ID = 3486]
1. Northern blot [Option ID = 13938]
2. Real time PCR [Option ID = 13939]
3. DNA microarray [Option ID = 13940]
4. DNA footprinting [Option ID = 13941]
Correct Answer :
DNA microarray [Option ID = 13940]
96) Which of the following methods is preferred for the long term storage of animal cell cultures?
[Question ID = 3487]
1. Liquid nitrogen [Option ID = 13942]
2. Spray drying [Option ID = 13943]
3. Lyophilization [Option ID = 13944]
4. Agar slopes covered with sterile mineral oil [Option ID = 13945]
Correct Answer :
Liquid nitrogen [Option ID = 13942]
97) Colletotrichum falcatum causes which of the following diseases?
[Question ID = 3488]
1. Red rot of sugarcane
[Option ID = 13946]
2. White rust of crucifers
[Option ID = 13947]
3. Ergot of rye
[Option ID = 13948]
4. Black stem rust of wheat
[Option ID = 13949]
Correct Answer :
Red rot of sugarcane
[Option ID = 13946]
98) Mutation in which of the following lambda phage genes/regulatory elements would give rise to clear plaques?
[Question ID = 3489]
1. cIII

---

[Option ID = 13950]
2. N
[Option ID = 13951]
3. ori O
[Option ID = 13952]
4. gam
[Option ID = 13953]
Correct Answer :
cIII
[Option ID = 13950]
99) Which one of the following is an obligate intracellular parasite?
[Question ID = 3490]
1. Mycobacterium
[Option ID = 13954]
2. Staphylococcus
[Option ID = 13955]
3. Rickettsia
[Option ID = 13956]
4. Streptococcus
[Option ID = 13957]
Correct Answer :
Rickettsia
[Option ID = 13956]
100) During uptake and mineralization of hydrocarbon by Pseudomonas sp, the role of rhamnolipid is:
[Question ID = 3491]
1. Oxidizing agent
[Option ID = 13958]
2. Reducing agent
[Option ID = 13959]
3. Hydrolyzing agent
[Option ID = 13960]
4. Biosurfactant
[Option ID = 13961]
Correct Answer :
Biosurfactant
[Option ID = 13961]

---