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MCQs:Unit1

1.Belowaresomestatementsaboutenzymes

1. enzymesarecatalysts2. enzymesareproteins3. enzymesdenatureathightemperatures

Whichofthestatementsarecorrect?

A 1and2 B 1and3 C 2and3 D 1,2and3

2.Thegraphshowstheeffectoftemperatureonthetimetakenforaproteaseenzymetodigestprotein.

Whichofthefollowingstatementsiscorrect?

A theoptimumtemperatureis0oC B theoptimumtemperatureis40oC C theoptimumtemperatureis60oC D theenzymeisdenatured40oC

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3.Whenasuspensionofeggwhiteproteinisdigested,itturnscolourless.Thediagramshowstheresultsofaddingaproteasetoasuspensionofeggwhiteinacidandalkalineconditions.

Whichoftherowsiscorrect?

locationofenzyme optimalpHA ileum acidB ileum alkaliC stomach acidD stomach alkali

4.Whichofthefollowingaretheproductsofanaerobicrespirationinanimals?

A carbondioxideandwater B carbondioxideandethanol C lacticacid D lacticacidandwater5.WhichonethefollowingisnotafunctionofATP? A activetransport B digestionoffood C musclecontraction D proteinsynthesis

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6.Thediagramshowsapparatususedtomeasuretheaerobicrespirationofgerminatingseeds.

Whichofthefollowingstatementsiscorrect? A thecolouredliquidwillmoveawayfromtheseedsastheyusecarbondioxide B thecolouredliquidwillmoveawayfromtheseedsastheyuseoxygen C thecolouredliquidwillmovetowardstheseedsastheyusecarbondioxide D thecolouredliquidwillmovetowardstheseedsastheyuseoxygen7.Whichofthefollowingsetsofconditionswouldmakediffusionofasubstanceintoacellfastest?

cellsurfacearea concentrationdifferenceA high highB high lowC low highD low low

8.Herearesomestatementsaboutactivetransport. 1.activetransportpumpsparticlesdownaconcentrationgradient 2.activetransportrequiresATP 3.activetransportrequireslivingcellsWhichofthestatementsarecorrect? A 1and2 B 1and3 C 2and3 D 1,2and3

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9.Thegraphshowsthetransportofmineralionsintoaplantroothaircellovertimewithoxygenandwithoutoxygen.

Whichprocessesdoestheroothaircellusetotransportthemineralions? A activetransportalone B activetransportanddiffusion C diffusionandosmosis D diffusionalone10.Whichofthefollowingisthecorrectorderofstructures? A cell,tissue,system,organ B cell,tissue,organ,system C cell,organ,system,tissue D cell,system,tissue,organ11.Whichrowcorrectlystatesthefunctionsoftheorganelles?

mitochondria ribosomes chloroplastsA photosynthesis proteinsynthesis respirationB photosynthesis respiration proteinsynthesisC respiration photosynthesis proteinsynthesisD respiration proteinsynthesis photosynthesis

12.Whichofthesestructuresarefoundinbothplantandanimalcells? A cellmembrane,cellwallandlargevacuole B cellmembraneonly C cellwallandlargevacuole D cellwallonly

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13.Whichrowcorrectlyidentifiesaprokaryoticcell?

nucleus mitochondriaA absent absentB absent presentC present absentD present present

14.Thediagramshowsayeastcell.

Whichofthefollowingstatementsaboutyeastiscorrect? A itisaeukaryoteandhasacellwallmadeofcellulose B itisaeukaryoteandhasacellwallmadeofchitin C itisaprokaryoteandhasacellwallmadeofcellulose D itisaprokaryoteandhasacellwallmadeofchitin15.ThediagramshowsasinglecelledorganismcalledEuglena.

InwhichkingdomshouldEuglenabeplaced? A animals B fungi

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C plants D protoctists16.Whichofthefollowingcanhavebothmulticellularandsingle-celledorganisms? A animals B bacteria C fungi D plants17.Whichofthefollowingrowsmatchesthecarbohydratemoleculewithacorrectgroup?

glycogen starchA animals fungiB fungi plantsC plants fungiD plants animals

18.Belowisalistofthecharacteristicsoflife. movement respiration sensitivity growth reproduction excretion nutrition controlHowmanyofthesecharacteristicsoflifedobacteriaexhibit? A 5 B 6 C 7 D 819.Whichofthefollowingstatementsaboutvirusesiscorrect? A virusesaremadeofcells B virusescanreproduceoutsidethebody C virusescarryDNAorRNA D virusesreleaseenergybyrespiration20.Whichofthefollowinggroupscontainexamplesofpathogens?

bacteria protoctists virusesA no no yesB no yes noC yes yes yesD yes no yes

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21.Belowaresomestatementsaboutfungi.• fungalhyphaereleaseenzymestodigestfood• thenetworkofhyphaeiscalledamycelium• manyfungiusesaprophyticnutrition• examplesoffungiincludeyeastandMucor

Howmanyofthestatementsarecorrect?A 1B 2C 3D 4

22.Whichofthefollowingisthecorrectsymbolequationforaerobicrespiration? A 6CO2 + 6H2O ! C6H12O6 + 6O2 B 6CO2 + 6H2O ! 2C3H6O3 + 6O2 C C6H12O6 + 6O2 ! 6CO2 + 6H2O D 2C3H6O3 + 6O2 ! 6CO2 + 6H2O

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Answers

1. D-1,2and32. B-theoptimumtemperatureis40oC3. B4. C-lacticacid5. B-digestionoffood6. D-thecolouredliquidwillmovetowardstheseedsastheyuseoxygen7. A8. C-2and39. B-activetransportanddiffusion10. B-cell,tissue,organ,system11. D12. B-cellmembraneonly13. A14. B-itisaeukaryoteandhasacellwallmadeofchitin15. D-protoctists16. C-fungi17. B18. D-819. C-virusescarryDNAorRNA20. C21. D-422. C