monday 17 may 2010 (afternoon) instructions to candidates for each question, choose ... past papers...

2210-6016 15 pages

M10/4/BIOLO/SPM/ENG/TZ2/XX+

Monday 17 May 2010 (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.

45 minutes

©International Baccalaureate Organization 2010

2 2 1 0 6 0 1 6

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1. Whatdoesasmallstandarddeviationsignify?

A. Thedataisnotcorrelated.

B. Thedataiswidelyspreadaroundthemean.

C. Thedatashowsacloserelationshipbetweentwovariables.

D. Thedataisclusteredcloselytothemeanvalue.

2. Inacell,whatistheeffectofalargesurfaceareatovolumeratio?

A. Slowerrateofexchangeofwastematerials

B. Fasterheatloss

C. Fasterrateofmitosis

D. Slowerintakeoffood

3. Howcancellsinamulticellularorganismdifferentiate?

A. Theyexpresssomeoftheirgenesbutnotothers.

B. Theyallhaveadifferentgeneticcomposition.

C. Differentcellscontainadifferentsetofchromosomes.

D. Differentcellsdonothavesomeofthegenes.

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4. Thediagrambelowshowsabacterium.

X

WhatstructuredoesthepartlabelledXidentify?

A. Nucleus

B. Nucleoid

C. Nucleolus

D. Nuclearmembrane

5. Whatdoprokaryoticcellshavethateukaryoticcellsdonot?

A. Mitochondria

B. 70Sribosomes

C. Histones

D. Internalmembranes

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6. WhathappensduringtheG2stageofinterphase?

A. Homologouschromosomespair

B. Synthesisofproteins

C. Homologouschromosomesseparate

D. ReplicationofDNA

7. Whatisaroleofsulfurinlivingorganisms?

A. Formationofproteins

B. Formationofcarbohydrates

C. Formationofteeth

D. Transmissionofnerveimpulses

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8. Whichmoleculesformthenucleotidemarkedinthediagram?

5’ end 3’ end

3’ end 5’ end

A T

C G

CG

T A

Structure of DNA

Nucleotide

A. phosphate,deoxyriboseandnitrogenousbase

B. phosphorus,riboseandnitrogenousbase

C. phosphorus,deoxyriboseandguanosine

D. phosphate,riboseandguanine

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9. Whichenzymecatalyzestheelongationoftheleadingstrand?

Synthesis of lagging strand

3’5’

5’

3’

3’5’

3’5’

Synthesis of leading strand

[Source:imagefromWKPurves,et al.,(2003)Life: The Science of Biology,4,SinauerAssociates(www.sinauer.com)andWHFreeman(www.whfreeman.com)]

A. RNApolymerase

B. Helicase

C. DNApolymerase

D. Ligase

10. Whichofthefollowingisafunctionofcelluloseinplants?

A. Storageoffat

B. Formationofmitochondria

C. Storageofenergy

D. Formationofcellwalls

11. Whichofthefollowingisthebestdefinitionofcellrespiration?

A. Aprocessneededtouseenergy,intheformofATP,toproduceorganiccompounds

B. Aprocessusedtoprovideoxygentotheatmosphere

C. Acontrolledreleaseofenergy,intheformofATP,fromorganiccompoundsincells

D. Acontrolledreleaseofenergyintheproductionoffoodfromorganiccompounds

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12. ThegraphbelowshowstheeffectoftemperatureontheseparationofthestrandsinDNAtoformsinglestrands.Thetemperatureatwhich50%oftheDNAissingle-strandediscalledthemeltingtemperature(TM).

%single-strandedDNA

1009080706050403020100

–10

TM

20 30 40 50 60 70 80 90 100Temperature/°C

Whatdotheresultsshow?

A. Whenthetemperaturereaches85°Ctherearenomoredouble-strandedDNAmolecules.

B. Whenthetemperaturereaches85°CtheDNAstrandsstartseparatingrapidly.

C. ATMof85°CmeansthatDNAisnotstableatroomtemperature(25°C).

D. TheseparationoftheDNAstrandsisdirectlyproportionaltotheincreaseintemperature.

13. Whichofthefollowingisthecauseofsickle-cellanemia?

A. Tryptophanisreplacedbyleucine.

B. Leucineisreplacedbyvaline.

C. Glutamicacidisreplacedbyvaline.

D. Lysineisreplacedbyglutamicacid.

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14. Whatdoesthekaryotypebelowcorrespondto?

A. Anormalmale

B. Anormalfemale

C. AfemalewithDownsyndrome

D. AmalewithDownsyndrome

15. AmanofbloodgroupAandawomanofbloodgroupBhaveachild. Ifbothareheterozygousfor thegene,whatare thechancesof themhavingachildwithbloodgroupB?

A. 0%

B. 25%

C. 50%

D. 75%

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16. Whichdiseaseisanexampleofsex-linked(X-linked)inheritance?

A. AIDS

B. Downsyndrome

C. Sickle-cellanemia

D. Hemophilia

17. ThediagrambelowrepresentstheresultsobtainedinaDNAprofilefromacrimescene.

Suspect1 Suspect2 Suspect3 Victim Crimescene sample

Sampleslots

Suspect 2 ismost likely to be the criminal because the band pattern coincides with that of thecrimescenesample. Whatdo thesebandsrepresent?

A. DNAfragments

B. Genes

C. Chromosomes

D. Chromatids

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18. Whatisagenetictestcross?

A. Testingasuspectedhomozygotebycrossingitwithaknownheterozygote

B. Testingasuspectedheterozygotebycrossingitwithaknownheterozygote

C. Testingasuspectedhomozygotebycrossingitwithaknownhomozygousdominant

D. Testingasuspectedheterozygotebycrossingitwithaknownhomozygousrecessive

Questions 19 and 20 refer to the food web below.

Sea otters

Sea urchins

Kelps and other algae

Microscopic planktonic algae

Drift algae anddead animals

Small predatoryfishes and invertebrates

Large crabs

Large fishes and octopuses

Sharks

Sea stars

Small herbivorousfishes and

invertebrates

Abalones

Planktonicinvertebrate

Sessile invertebrates

[Source:http://cbc.amnh.org/crisis/foodweb.html]

19. Whatwillhappentothesizesofthepopulationsinthefoodwebaboveiftheseaotterdisappears?

A. Largefishincreaseandseaurchinsdecrease.

B. Abalonesincreaseandsharksincrease.

C. Seaurchinsincreaseandkelpsdecrease.

D. Seastarsdecreaseandsharksincrease.

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20. Whichorganisminthisfoodwebisbothasecondaryandtertiaryconsumer?

A. Largecrab

B. Smallherbivorousfish

C. Shark

D. Microscopicplanktonicalgae

21. Whichgaswillenhancethegreenhouseeffectifreleasedintotheatmosphere?

A. Hydrogen

B. Oxideofnitrogen

C. Oxygen

D. Nitrogen

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22. Whatdothegraphsbelowshow?

Key: male female

Mexico Age United States80+75–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–4

8 6 4 2 0 2 4 6 8 6 4 2 0 2 4 6Percentageofpopulation

A. PopulationintheUnitedStatesisincreasingatahigherrate.

B. Infantdeathrateishighinbothcountries.

C. Maleslivelongerthanfemalesinbothcountries.

D. BirthrateishigherinMexicothanintheUnitedStates.

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23. Whichphylumdoestheplantbelowbelongto?

A. Angiospermophyta

B. Bryophyta

C. Coniferophyta

D. Filicinophyta

24. Whichfeatureincreasestheabsorptionofglucoseinthesmallintestine?

A. Villi

B. Lacteal

C. Cilia

D. Gobletcells

25. Whatisacorrectpathwayforbloodflowingthroughtheheart?

A. rightatrium,rightventricle,aorta

B. leftatrium,leftventricle,pulmonaryartery

C. rightatrium,rightventricle,pulmonaryartery

D. leftatrium,leftventricle,pulmonaryvein

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26. Whyareantibioticseffectiveagainstbacteria?

A. Theycanproducespecificantibodies.

B. Theycanengulfforeignmatter.

C. Theycanblockspecificmetabolicpathways.

D. Theycanactasavaccine.

27. Whichofthefollowingfeaturesofthealveoliadaptthemtogaseousexchange?

I. Singlelayerofcells

II. Filmofmoisture

III. Densenetworkofcapillaries

A. IandIIonly

B. IIonly

C. IIandIIIonly

D. I,IIandIII

28. WhatisaneffectoftheHIVvirusontheimmunesystem?

A. Reductionofthenumberofphagocytes

B. Reductionofthenumberoflymphocytes

C. Increaseintheabilitytoformantibodies

D. Decreaseintheabilitytoproduceantigens

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29. Whathappenstotheexternalandinternalintercostalmusclesanddiaphragmwheninhaling?

External intercostal muscles Internal intercostal muscles Diaphragm

A. relax relax relaxes

B. contract relax relaxes

C. relax contract contracts

D. contract relax contracts

30. Whichofthefollowingis/arearoleoftestosteroneinmales?

I. Pre-nataldevelopmentofmalegenitalia

II. Maintenanceofsexdrive

III. Increaseinmentaldevelopment

A. IIonly

B. IandIIonly

C. IIandIIIonly

D. I,IIandIII

monday 17 may 2010 (afternoon) instructions to candidates for each question, choose ... past papers...

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