2209-6007 18 pages

M09/4/BIOLO/HPM/ENG/TZ1/XX+

Wednesday 6 May 2009 (afternoon)

BiologyHigHer 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.

1 hour

© International Baccalaureate Organization 2009

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1. Whatdoesthefollowingscattergraphshow?

VariableY

16141210864200 2 4 6 8 10 12 14 16 VariableX

A. Nocorrelationbetweenthesevariables

B. Strongpositivecorrelationbetweenthesevariables

C. Strongnegativecorrelationbetweenthesevariables

D. Weaknegativecorrelationbetweenthesevariables

2. Whatconditionsmustbemetforthet-testtobeapplied?

I. Populationsampledmusthaveanormaldistribution II. Variablemeasurediscontinuous III. Samplesizemustbe>30

A. Ionly

B. IIandIIIonly

C. IandIIonly

D. I,IIandIII

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3. Howdoesthesurfaceareatovolumeratiochangewithanincreaseincellsize?

A.

Surfacearea/volume

B.

Surfacearea/volume

Cellsize Cellsize

C.

Surfacearea/volume

D.

Surfacearea/volume

Cellsize Cellsize

4. Howdoprokaryoticcellsdivide?

A. Bymitosis

B. Bymeiosis

C. Bybudding

D. Bybinaryfission

5. Whatcantheextracellularmatrixofcellsbemadeof?

I. Polysaccharide II. Glycoprotein III. Phospholipid

A. Ionly

B. IandIIonly

C. IIandIIIonly

D. I,IIandIII

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6. Duringwhichphaseofthecellcycledochromosomesduplicate?

A. G1

B. S

C. G2

D. Mitosis

7. Whichdiagramrepresentsthepolarityofawatermolecule?

A.

H HO

+

− −

B.

H HO

−

+ +

C.

O OH

−

+ +

D.

H HO

−

− +

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8. InthemodeloftheDNAmoleculeshownbelow,whicharrowspointtocovalentbonds?

IV

II

III

I

A. I,IIandIIIonly

B. II,IIIandIVonly

C. I,IIIandIVonly

D. I,IIandIVonly

9. Whathappensduringthepathwayofglycolysis?

A. Glucoseisbrokendownintopyruvate.

B. Carbondioxideisproduced.

C. MoreATPisconsumedthanisproduced.

D. Lacticacidisproduced.

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10. Whatislightenergyusedforduringphotosynthesis?

A. Toproducecarbondioxide

B. Toproducewatermolecules

C. ToproduceATP

D. Tobreakdownsugarmolecules

11. Red-green colour blindness is a sex-linked condition. Which of the following always shows normalvision?

A. Ahomozygousmale

B. Ahomozygousfemale

C. Aheterozygousmale

D. Aheterozygousfemale

12. In a cross between red haired cattle and white haired cattle the offspring produced are alwaysa colour called roan (light red). If the roan cattle are interbred they produce white, roan andredoffspring.

Howmanyallelesarecontrollingthischaracter?

A. 1

B. 2

C. 3

D. 4

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13. Whatevidence isgiven in thepedigreechartbelow toestablish that thecondition iscausedbya dominantallele?

Key:unaffectedmaleaffectedmaleunaffectedfemaleaffectedfemale

A. Twounaffectedparentshaveunaffectedchildren.

B. Twoaffectedparentshaveaffectedchildren.

C. Anaffectedparentandanunaffectedparenthaveaffectedchildren.

D. Twoaffectedparentshaveanunaffectedchild.

14. Whatconclusioncanbemade from the followingevidence fromananalysisofDNAfragments?

man

childI

childII

wom

an

A. Bothchildrenarerelatedtobothparents.

B. ChildIisrelatedtothemanbutchildIIisnot.

C. Bothchildrenareunrelatedtoeitheroftheparents.

D. ChildIIisrelatedtothemanbutchildIisnot.

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15. Slime moulds (Acrasiomycota) are protoctists. They feed on decaying organic matter, bacteria andprotozoa.

Whichofthetermsdescribestheirnutrition?

I. Detritivore II. Autotroph III. Heterotroph

A. Ionly

B. IandIIonly

C. IandIIIonly

D. I,IIandIII

16. Severalgreenhousegasesoccurintheatmosphere.Carbondioxide(CO2)isoneofthembutsoaremethane(CH4)andoxidesofnitrogen(NOx).

Whyareoxidesofnitrogenclassedasgreenhousegases?

A. Theytrapsomeofthelong-waveradiationemittedbytheEarth’ssurface.

B. Theypreventshort-waveradiationfromreachingtheEarth’ssurface.

C. Theydissolveinrainwatertoproduceacidrain.

D. TheyareonlyproducedbyhumanactivitywhereasCO2andCH4arealsoproducednaturally.

17. Whatisthemechanismofnaturalselection?

A. Anyindividualsinapopulationcanbeselectedentirelybychance.

B. Afterachangeintheenvironmentaspecieswillevolveadaptationstothenewconditions.

C. Ifanadaptationto theenvironment isuseful,an individualwilldevelopitandpass itontoitsoffspring.

D. Variationsamongstindividualsofapopulationareselectedbyachangingenvironment.

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18. WhichoftheorganismsA–D,identifiedbythekeybelow,representsanAnnelid?

1. Showsbilateralsymmetry goto2 Doesnotshowbilateralsymmetry Cnidaria

2. Hasasegmentedbody goto3 Doesnothaveasegmentedbody goto4

3. Hasjointedlegs A Doesnothavejointedlegs B

4. Hasashell C Doesnothaveashell D

19. Whichofthefollowingpartsofthedigestivesystemsecreteproteases?

Stomach Small Intestine Large Intestine

A. Yes Yes No

B. Yes No Yes

C. Yes No No

D. No No No

20. Whyareantibioticseffectiveagainstbacteriabutnotviruses?

A. Virusescanhideinsidehostcells.

B. Bacteriaarerecognizedaspathogensbutvirusesarenot.

C. Theenzymesofbacteriacanbeinhibitedbyantibiotics.

D. Virusesareresistanttoantibiotics.

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21. The diagrambelow represents the homeostatic control of body temperature. What does the partlabelledXrepresent?

X

musclesofskinarteriolewalls

skeletalmuscles

NEGATIVEFEEDBACKbloodtemperature

corebodytemperature<37 C°

returnto37 C°

A. Heart

B. Kidney

C. Pituitary

D. Hypothalamus

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22. WhatarethestructureslabelledIandIIonthediagramofthemalereproductivesystem?

I

II

I II

A. Testis Seminalvesicle

B. Vasdeferens Testis

C. Seminalvesicle Epididymis

D. Seminalvesicle Prostategland

23. Whatarethefundamentalstructuralunitsofeukaryoticchromosomes?

A. Nucleosomes

B. Centromeres

C. Histones

D. Nucleoids

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24. TheantisensestrandontheDNAmoleculecodingforthreecodonsofageneis

TATCGCACG

WhataretheanticodonsofthethreetRNAmoleculesthatcorrespondtothissequence?

A. UAU,CGCandACG

B. ATA,GCGandTGC

C. AUA,GCGandUGC

D. TAT,CGCandACG

25. WhatisthefunctionofthetRNAactivatingenzyme?

A. ItlinkstRNAtoribosomes.

B. ItlinkstRNAtomRNA.

C. ItlinkstRNAtoaspecificaminoacid.

D. ItlinksanaminoacidononetRNAtoanaminoacidonanothertRNA.

26. Whichbestdescribesthetertiarystructureofaprotein?

A. Theinteractionofpolypeptidesubunitsandprostheticgroups

B. Interactionsforminghydrogenbondsbetweentheaminoacids

C. Thesequenceofaminoacidsinthepolypeptidechain

D. Thestructureformedfrominteractionsbetweentheaminoacidsidegroups

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27. Whereiscarbondioxideproducedinthemitochondrion?

C D

B

A

28. Inthemitochondrialelectrontransportchain,whatisthelastelectronacceptor?

A. CO2

B. H2O

C. O2

D. NAD

29. Wherearecomplexcarbohydratesmadeinthechloroplast?

A. Intheintermembranespace

B. Inthestroma

C. Ontheinnermembrane

D. Inthethylakoidspace

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30. Whichofthefollowinggraphsrepresentstheeffectofchanginglightintensityontherateofoxygenproductionbyagreenplant?

A. Oxygenproduction

0

B. Oxygenproduction

0

Lightintensity Lightintensity

C. Oxygenproduction

0

D. Oxygenproduction

0

Lightintensity Lightintensity

31. Whatisadifferencebetweenthefeaturesofmonocotyledonsanddicotyledons?

Monocotyledons Dicotyledons

A. Taproots Fibrousroots

B. Twoseed-leaves Oneseed-leaf

C. Vasculartissueinringsinthestem Vasculartissuescatteredthroughthestem

D. Parallel-veinedleaves Net-veinedleaves

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32. Whatcausesstomatatoclose?

A. Increaseintheturgoroftheguardcells

B. AhighlevelofCO2intheleaftissues

C. Thepresenceofabscisicacid

D. MovementofK+intotheguardcells

33. Whatisthecorrectsequenceofeventsinthegerminationofastarchseed?

A. gibberellinproduced

waterabsorbed

hydrolysisoffoodreserves

proteinsynthesis

enzymesproduced

B. waterabsorbed

hydrolysisoffoodreserves

proteinsynthesis

gibberellinproduced

enzymesproduced

C. waterabsorbed

gibberellinproduced

proteinsynthesis

enzymesproduced

hydrolysisoffoodreserves

D. gibberellinproduced

waterabsorbed

proteinsynthesis

enzymesproduced

hydrolysisoffoodreserves

34. Whendochiasmataforminmeiosis?

A. DuringprophaseI

B. DuringmetaphaseI

C. DuringanaphaseI

D. DuringprophaseII

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35. Whichofthefollowingprocessesresultintheproductionofrecombinants?

I. Crossingoverbetweenlinkedgenes II. Reassortmentofnon-linkedgenes III. Mutation

A. Ionly

B. IandIIonly

C. IandIIIonly

D. I,IIandIII

36. Whatisrequiredtoproducemonoclonalantibodies?

A. T-lymphocytesandoocytes

B. T-lymphocytesandearlyembryocells

C. B-lymphocytesandtumourcells

D. B-lymphocytesandstemcells

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37. WhatdoeslabelXindicate?

A. Sarcolemma

B. Sarcomere

C. Sarcoplasmicreticulum

D. Endoplasmicreticulum

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38. Whichprocessesarerequiredforthereabsorptionofglucoseinthekidneytubules?

I. Simplediffusion II. Facilitateddiffusion III. Activetransport

A. IandIIonly

B. IIandIIIonly

C. IandIIIonly

D. I,IIandIII

39. Whatistheroleoftestosteroneinspermatogenesis?

A. Itstimulatesinterstitialcells.

B. ItstimulatesSertolicells.

C. Itinhibitsthegerminalepithelium.

D. Itinhibitstheprostategland.

40. WhatistheroleofHCGinearlypregnancy?

A. HCGstimulatesFSHsecretions.

B. HCGstimulatesthedegenerationofthecorpusluteum.

C. HCGstimulatesovarianestrogenandprogesteronesecretion.

D. HCGstimulatesuterinecontractions.