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BiologyMCQ(MultipleChoiceQuestionsinLifeScience)(Sample/Model/PracticeQuestionsforJRF/NETLifeScienceExamination,ICMRJRF,DBTJRF,GATE,ICARNET,PGEntrance)

ICMRJRFEntranceExamination2015ModelQuestionswithAnswersandExplanationsPart3(MCQ015)

1. Pickoutthecorrecttaxonomichierarchyinzoologicalsystematics.a. Phylum–Class–Order–Family–Genusb. Class–Phylum–Order–Family–Genusc. Phylum–Class–Family–Order–Genusd. Phylum–Class–Order–Genus–Species

2. Inmolecular systematics of animals,which for the following candidate gene havebeenextensivelyused?

a. DNAPolymeraseb. CytochromeCc. RNAPolymerased. Collagen

3. Themostprobableplacewherelifewouldhaveoriginated_________‐‐.a. Outerspaceb. Barrenrocksc. Inoceansd. Deephydrothermalvents

4. Whichofthefollowingfactorisleastresponsibleforgeneticdrift?a. Migrationb. Foundereffectc. Bottleneckphenomenond. Restrictionofresources

5. Instomach,themucuswhichprotecttheepithelialliningofstomach,issecretedby:a. Gobletcellsb. Parietalcellsc. Microvillid. Acinercells

6. InapopulationwithHardy‐Weinbergequilibrium,twoalleles‘b’and‘B’showedanallelic frequencyof0.7and0.3 respectively.Howmany individuals ina sampleof250fromthispopulationcanbeexpectedtobeheterozygous(bB)?www.easybiologycla

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a. 55b. 105c. 110d. 42

7. Chitinisamajorcellwallcomponentof__________a. Bacteriab. Arthropodsc. Fungusd. Mollusks

8. Theanti‐cancerousdrugobtainedfromCatharanthusroseusis__________.a. Taxolb. Vincristinec. Colchicined. Serpentine

9. Yeastwithpetite colonywhen crossedwithwild type generates nopetite colony.Themostprobablemodeofinheritanceis__________

a. Chloroplastb. Mitochondriac. Episomald. Nuclear

10. An oligonucleotide DNA sequence tagged with fluorescent tag used to identifyunknowngenebyhybridizationistermedas

a. Probeb. Reportergenec. Ligandd. c‐DNA

11. Bacteriaundergomultiplicationby:a. Binaryfissionb. Mitosisc. FissionandMitosisd. Fragmentation

12. BacterialDNApolymeraseIlackwhichofthefollowingactivity?a. 5’→3’polymeraseactivityb. 3’→5’polymeraseactivityc. 5’→3’exo‐nucleaseactivityd. 3’→5’exo‐nucleaseactivity

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13. Acrossbetweenaredeyedmaleflyandawhiteeyedfemaleflyproducesredeyedfemaleandwhiteeyedmaleprogenies.Whilereciprocalcrossproducesalloffspringwithredeyes.Thetraitforeyecolouris:

a. Sexlinkedtraitsb. Sexinfluencedtraitc. Sexlinkedhomogameticmaled. Sexlinkedheterogameticmale

14. ThenaturalhabitatofNilgiri‐tahrisa. Sholagrasslandsb. Nilgiriforestsc. SholagrasslandsandNilgiriforestsd. AthighaltitudesofSouth‐WesternGhats

15. When releasing factor binds to stop codon on m‐RNA during translation, thesynthesizedpeptidechainistransferredto

a. t‐RNAb. Waterc. H+d. Aminoacids

16. LocationofGlutamatesynthetaseenzymeinplantsis:a. Onlycytoplasmb. Onlychloroplastc. Bothincytoplasmandchloroplastd. Inmitochondria

17. Whichistrueforβ‐oxidationoffattyacidsa. FormationofmalonylCoAb. FormationofacetoacylACPc. TransportofAcylCoAintomitochondriad. UseofNADPH2

18. The radio isotope which is usually incorporated into thymine to study DNAreplicationprocessis

a. 32Pb. 35Sc. 3Hd. 14C

19. Enzymesacceleratesrateofreactionby:a. Loweringnumberoftransitionstatesb. Loweringtheactivationenergyofhighesttransitionstatec. Providingenergytosubstratewww.easybiologycla

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d. Providingmorechancetosubstratestoreacttogether20. Enzymeneverinterferewith:

a. Freeenergyofreactionb. Rateofreactionc. Activationenergyoftransitionstated. Reactionequilibrium

21. As we move from one geographical region to next neighbouring region, speciesdiversitytendstochange.Itistermedas

a. α‐diversityb. β‐diversityc. γ‐diversityd. δ‐diversity

22. Globular proteins when treated with organic solvents get denatured. The maininteractionwhichisaffectedontreatmentwithorganicsolventis:

a. Hodrogenbondsb. Covalentbondsc. Ionicinteractionsd. Hydrophobicinteractions

23. Whichregionofvisiblelightismostusefulforphotosynthesis?a. Blueandredb. Greenandredc. Violetandblued. Greenandblue

24. Fog,whichiscommonlyobservedduringwinterismainlyseenata. Lowaltitudewithpollutionb. Highaltitudewithoutpollutionc. Highaltitudewithpollutiond. Lowaltitudewithoutpollution

25. Whatwouldbetheeffectofincreasinghumidityintherateoftranspiration?a. Rateoftranspirationwilldecreaseb. Rateoftranspirationwillincreasec. Initiallytheratewillbelowthenitwillbehighd. Rateoftranspirationwillbeunaffected

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