BIOLOGY STANDARD LEVEL PAPER 1 - ibdocuments.com PAST PAPERS - YEAR/2012 Examination... ·...

2212-6010 12 pages

M12/4/BIOLO/SPM/ENG/TZ1/XX

Thursday 17 May 2012 (afternoon)

BIOLOGYSTANDARD LEVELPAPER 1

INSTRUCTIONS TO CANDIDATES

• Do not open this examination paper until instructed to do so.• Answer all the questions.• For each question, choose the answer you consider to be the best and indicate your choice on

the answer sheet provided.• The maximum mark for this examination paper is [30 marks].

45 minutes

©International Baccalaureate Organization 2012

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1. Themeanheight for adultmen in theUnitedStates is 1.78mwith a standarddeviationof 8cm.Whichstatementistrue?

A. ThetallestmanintheUnitedStatesis1.86mtall.

B. 68%ofmenintheUnitedStatesarebetween1.74mand1.82mtall.

C. 68%ofmenintheUnitedStatesarebetween1.70mand1.86mtall.

D. 100%ofmenintheUnitedStatesarewithintwostandarddeviationsof1.78m.

2. Whichpropertymakesstemcellssuitablefortherapeuticuse?

A. Theycandividebymeiosistoformgametes.

B. Theycontainchemicalsthatcankillbacteria.

C. Theirchromosomesaresuitableforgenetransferandcloning.

D. Theycandifferentiateintospecializedcells.

3. Whichfeaturesarepresentinprokaryoticcells?

A. DNA,plasmamembraneandmitochondria

B. DNA,cellwallandpili

C. ribosomes,chloroplastsandcellwall

D. cytoplasm,ribosomesandroughendoplasmicreticulum

4. Whereinthecelldocondensationreactionsinvolvingaminoacidsoccur?

A. Nucleus

B. Golgiapparatus

C. Ribosomes

D. Lysosome

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5. Whichprocessispossibleduetothefluidityofcellmembranes?

A. Endocytosis

B. Osmosis

C. ATPproduction

D. Cellrecognition

6. InwhichstageofmitosisisthecelllabelledX?

X

A. Anaphase

B. Interphase

C. Metaphase

D. Prophase

7. Betweenwhichatomsdohydrogenbondsforminwater?

A. Oxygenandhydrogenatomsinthesamewatermolecule

B. Oxygenandhydrogenatomsindifferentwatermolecules

C. Hydrogenatomsinthesamewatermolecule

D. Oxygenatomsofdifferentwatermolecules

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8. Whichcarboncompoundproducedbylivingorganismsisinorganic?

A. DNA

B. Cellulose

C. Glucose

D. Carbondioxide

9. WhatoccursduringDNAreplication?

A. DNApolymeraseseparatesthetwoDNAstrands.

B. DNAmoleculescontainingnucleotidesfromtheoriginalmoleculeareproduced.

C. Adenineformsabasepairwitheitherthymineoruracil.

D. Newbasesattachtotheoriginalsugar-phosphatebackbone.

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10. Whichgraphshowstheeffectofincreasingthesubstrateconcentrationonenzymeactivity?

A. Enzymeactivity

B. Enzymeactivity

Substrateconcentration Substrateconcentration

C. Enzymeactivity

D. Enzymeactivity

Substrateconcentration Substrateconcentration

11. Whichchemicalisproducedduringbothaerobicandanaerobicrespirationinhumans?

A. Carbondioxide

B. Pyruvate

C. Water

D. Lactate

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12. Howisoxygenproducedduringphotosynthesis?

A. WatermoleculesaresplitwithenergyfromATP.

B. Watermoleculesaresplitwithenergyfromlight.

C. CarbondioxidemoleculesaresplitwithenergyfromATP.

D. Carbondioxidemoleculesaresplitwithenergyfromlight.

13. Thesequenceofthefirstsixaminoacidsofthenormalβhemoglobin(HbA)chainarelisted.

valine–histidine–leucine–threonine–proline–glutamicacid

Which sequence of amino acids could there be in the first six amino acids of the sickle-cellβhemoglobin(HbS)chain?

A. glutamicacid–histidine–leucine–threonine–proline–valine

B. valine–valine–histidine–leucine–threonine–proline

C. glutamicacid–histidine–leucine–threonine–proline–glutamicacid

D. valine–histidine–leucine–threonine–proline–valine

14. Ifthereare16chromosomesinacellthatisabouttodivide,whatwillbethenumberofchromosomesinadaughtercellafterdivisionbymitosisormeiosis?

Mitosis Meiosis

A. 16 16

B. 16 8

C. 8 16

D. 8 8

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Questions 15 and 16 refer to the following information.

Aman has hemophilia, a condition caused by a recessive sex-linkedallelecarriedontheXchromosome.

15. Whichofhisgrandparentsmustbeacarrierifnoneofthemhadthedisease?

A. Maternalgrandmother(hismother’smother)

B. Maternalgrandfather(hismother’sfather)

C. Paternalgrandmother(hisfather’smother)

D. Paternalgrandfather(hisfather’sfather)

16. Hiswifedoesnotcarrythehemophiliaallele.Whatwouldbeexpectedintheirchildren?

Sons Daughters

A. allnormal allcarriers

B. halfhemophiliac allcarriers

C. allnormal halfcarriers

D. halfhemophiliac allnormal

17. Whatmakesgenetransferbetweenspeciespossible?

A. Allspeciesusethesamegeneticcode.

B. Allspecieshavethesamegeneticmaterial.

C. Allspeciesproducethesamepolypeptides.

D. Allspeciestranscribegenesusingplasmids.

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18. Inapond,twospeciesoffishfeedoninsectsandworms.Theinsectsfeedonthegreenplantsthatliveinthewater.Whatconstitutesapopulationinthisecosystem?

A. Allthelivingorganisms

B. Alltheanimals

C. Allthefish

D. Allthefishofonespecies

19. Whatisrecycledinanecosystem?

A. Nitrogen,carbonandenergyareallrecycled.

B. Nitrogenandcarbonarerecycledbutnotenergy.

C. Nitrogenisrecycledbutnotcarbonorenergy.

D. Nitrogen,carbonandenergyarenotrecycled.

20. Inapopulationofrabbitsstudiedoveraperiodofsixmonths,itwasfoundthatnatalitywasgreaterthanmortalityandemigrationwasgreaterthanimmigration.Whatcanbeconcludedaboutthefinalpopulationofrabbits?

A. Itwillhaveincreased.

B. Itwillhavedecreased.

C. Itwillbeexactlythesame.

D. Thereisnotenoughinformationtomakeavalidconclusion.

21. Whatcharacteristicsdescribehomologousstructures?

A. Theyhavethesameancestraloriginbutmayhavedifferentfunctions.

B. Theyhavethesameancestraloriginandalwayshavethesamefunction.

C. Theyhavedifferentancestraloriginsandmayhavedifferentfunctions.

D. Theyhavedifferentancestraloriginsbutalwayshavethesamefunction.

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22. The Atlantic cod (Gadus callarias) is a fish which lays about 5000000 eggs in its lifetime.Onaverage,onlytwooftheseeggssurvivetobecomeadultcod.Howdoesthispromoteevolution?

A. Alloffspringaregeneticallyidentical,sobecomebetteradapted.

B. Layingmanyeggsprovidesfoodforotherspeciestosurviveandbecomebetteradapted.

C. Some young cod change to become adapted to the environment and survive and pass ontheirgenes.

D. Offspringwithfavourablevariationssurviveandpassontheirgenes.

23. Basedonbinomialnomenclature,whichtwospeciesaremostcloselyrelated?

I. Commonbarberry(Berberis vulgaris)

II. Canadianbunchberry(Cornus canadensis)

III. Smoothblackberry(Rubus canadensis)

IV. Canadianbarberry(Berberis canadensis)

A. IandIV

B. IIandIII

C. IIandIV

D. IIIandIV

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24. Thediagrambelowshowsthehumandigestivesystem.

Inwhichpartsofthedigestivesystemaremostwaterandglucoseabsorbed?

Water Glucose

A. II I

B. II III

C. III II

D. III III

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25. Whatistheconditionofthevalvesoftheheartwhentherightventricleiscontracting?

Atrio-ventricular valve Semilunar valve

A. open open

B. open closed

C. closed closed

D. closed open

26. WhateffectdoesHIVhaveontheimmunesystem?

A. Itpreventsleucocytesfromfightingbacteriabyphagocytosis.

B. Itcausesexcessiveproductionofleucocytesinbonemarrow.

C. Itdestroysantibodiesproducedbyleucocytes.

D. Itlowersthenumberofleucocytes,reducingantibodyproduction.

27. Whatisasimilaritybetweenarteriesandcapillaries?

A. Theybothhaveelastictissue.

B. Theybothhavesmoothmusclecells.

C. Neitherhascollagenfibresintheirwalls.

D. Neitherhasvalves.

28. Whatisacharacteristicofaxonsinmotorneurons?

A. Whenthereisarestingpotential,theoutsideoftheaxonisnegativerelativetotheinside.

B. Duringanactionpotential,Na+ionsdiffuseoutoftheaxon.

C. K+ionsdiffusingoutoftheaxonrepolarizesit.

D. Impulsesintheaxontraveltowardsthecellbody.

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29. Whichresponsetakesplacewhenbloodglucoselevelsarelow?

A. Glucagonisreleasedfromtheαcellsofthepancreaticislets.

B. Glucagonisreleasedfromtheβcellsofthepancreaticislets.

C. Insulinisreleasedfromtheαcellsofthepancreaticislets.

D. Insulinisreleasedfromtheβcellsofthepancreaticislets.

30. Duringthemenstrualcycle,whatoccursinresponsetoafallintheprogesteronelevel?

A. Growthoftheuteruslining

B. Growthofthefolliclesurroundingtheegg

C. Ovulation

D. Menstruation