N15/4/BIOLO/SPM/ENG/TZ0/XX

BiologyStandard levelPaper 1

Thursday 5 November 2015 (morning)

45 minutes

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].

12 pages © International Baccalaureate Organization 20158815 – 6004

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1. Twopopulationsofthesamefishspecieswerefeddifferentdietstoinvestigatetheeffectofdifferingnutritionontheirgrowth.Whatisanappropriatemethodtodeterminethesignificance ofaresultingdifference?

A. Calculatethemeanforeachpopulation

B. Calculatethestandarddeviationforeachpopulation

C. Graphtheresults

D. Performat-test

2. Whichshowstheorderofsizefromsmallesttolargest?

A. Viruses→cellmembranethickness→eukaryoticcells→prokaryoticcells

B. Cellmembranethickness→prokaryoticcells→viruses→eukaryoticcells

C. Cellmembranethickness→viruses→prokaryoticcells→eukaryoticcells

D. Viruses→cellmembranethickness→prokaryoticcells→eukaryoticcells

3. Animalcellsoftensecreteglycoproteinsasextracellularcomponents.Whatisaroleoftheseglycoproteins?

A. Adhesion

B. Additionalenergyreserve

C. Membranefluidity

D. Wateruptake

4. Duringwhichstagedoesthecellsurfaceareatovolumeratiodecrease?

A. Interphase

B. Metaphase

C. Telophase

D. Cytokinesis

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5. TheimagerepresentsanEscherichia coli.

X

[Source:https://upload.wikimedia.org/wikipedia/commons/8/84/Escherichia_coli_by_togopic.png]

WhatisthefunctionofstructureX?

A. Activetransport

B. Attachment

C. Binaryfission

D. Cellrespiration

6. Whichalwayscontainscarbon,hydrogenandoxygen?

I. Carbohydrate II. Protein III. Fat

A. IandIIonly

B. IandIIIonly

C. IIandIIIonly

D. I,IIandIII

7. Whichmoleculecanbehydrolyzed?

A. Glycerol

B. Maltose

C. Fructose

D. Galactose

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8. Thediagramshowsadinucleotide.

Bond

Whichtypeofbondisidentifiedbythearrow?

A. Phosphate

B. Hydrogen

C. Covalent

D. Peptide

9. WhatisrequiredtoreplicateDNA?

A. Temperatureof37°C

B. FreenucleotidescarryingA,C,GandTbases

C. Plasmids

D. Endonuclease

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10. Howistheinformationinthegeneticcodeused?

A. Topredictthegenotypeofgametes

B. Todistinguishprokaryoticgenomesfromeukaryoticgenomes

C. Todeducephenotypesinpedigreecharts

D. TotranslatemRNAintopolypeptides

11. Whatdescribesanaerobiccellrespiration?

A. Glucosebreakdowntopyruvate

B. Carbondioxidefixation

C. NoATPformation

D. Occursinthemitochondrion

12. Inapersonwhoisheterozygousforsickle-cellanemia,whereisthemutationfound?

A. Ineverygameteproduced

B. OnlyingametescarryinganXchromosome

C. Inallbraincells

D. Inbloodplasma

13. Duringwhichstageofmeiosisdoescrossingoverusuallyoccur?

A. ProphaseI

B. MetaphaseI

C. ProphaseII

D. MetaphaseII

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14. Whatisthechromosomenumberinahumangametewithnon-disjunction?

A. 46

B. 45

C. 24

D. 23

15. InahumanwithtypeAblood,whatdeterminesthebloodgroup?

A. Sexchromosomes

B. Oneortwoalleles

C. Multiplealleles

D. Codominantalleles

16. Acolourblindmanandawomancarrierforcolourblindnesshaveason.Whatistheprobabilitythattheirsonwillbecolourblind?

A. 25%

B. 50%

C. 75%

D. 100%

17. LaboratoryanalysisofDNAfroma40000yearoldwoollymammothusedthepolymerasechainreaction(PCR).WhatroledidthePCRhaveintheanalysis?

A. DNAdenaturation

B. DNAcomparison

C. DNAseparation

D. DNAamplification

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18. TheimageshowsafemaleGoldenOrb-weavingspider(Nephila plumipes).Theycangrowaslargeas4cmandbuildwebsstrongenoughtotrapsmallbirdsforfood.

[Source:©MarkCrocker.Usedwithpermission.]

Whichofthefollowingdescribe(s)thisspider?

I. Primaryconsumer II. Heterotroph III. Arthropod

A. Ionly

B. IandIIonly

C. IIandIIIonly

D. I,IIandIII

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19. ImageIshowsaspottedhyena(Crocuta crocuta)andimageIIshowsaleopardtortoise(Geochelone pardalis).

ImageI ImageII

[Source:DesertUSA.Com] [Source:“Geochelonepardalisbw01”byBertholdWerner-Ownwork.LicensedunderCCBY-SA3.0viaCommons-https://commons.wikimedia.org/wiki/File:Geochelone_pardalis_bw_01.jpg#/media/File:Geochelone_pardalis_bw_01.jpg]

Basedontheirdiet,thefecesofspottedhyenasappearwhitebecauseofhighcalciumcontent. Leopardtortoiseseathyenafeces.Whatwouldexplainsuchtortoisebehaviour?

A. Theyaresaprotrophs.

B. Theytransformenergywith100%efficiency.

C. Theyneedtoformbonesandshell.

D. Theyonlyeatinorganicmatter.

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20. Thediagramrepresentsthecarboncycle.

Respiration in decomposers

Fossilization

Death

DeathFeeding

Carbon infossil fuels

Organic compounds in animals

Carbon compoundsin dead organic matter

Organic compounds in green plants

Carbon dioxide inthe atmosphere

Respiration

Photosynthesis

Combustion

Respiration

[Source:adaptedfromhttp://content.answcdn.com]

Whichprocesshasthegreatestrelativeroleintransferringcarbon?

A. Decomposition

B. Combustion

C. Photosynthesis

D. Cellrespiration

21. Whatcontributestotheenhancedgreenhouseeffect?

A. Ozonefromviolentthunderstorms

B. Carbonparticlesindieselengineexhaust

C. Methanefromagriculturalsources

D. Carbondioxidefromactivevolcanoesaroundtheworld

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22. TheimageshowsanAcacia tortilistreewhichisoneof13speciesofAcacia.AllsuchfloweringtreesareexamplesofFabaceae.

[Source:“Eat267”.LicensedunderCCBY-SA3.0viaCommons- https://commons.wikimedia.org/wiki/File:Eat267.jpg#/media/File:Eat267.jpg]

WhatisthehighestleveloftaxaforAcacia tortilis?

A. Acacia

B. Tortilis

C. Fabaceae

D. Angiospermophyta

23. Darwindescribedevolutionas“descentwithmodification”.Whatwouldmakeevolutionlessprobable?

A. Stableenvironment

B. Migration

C. Variationinoffspring

D. Randommutation

24. Whatstructuresinthesmallintestinetransportmostfats?

A. Collectingducts

B. Capillaries

C. Veins

D. Lacteals

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25. Whatcausesheartventriclestofillwithblood?

I. Atrialcontraction II. Closingofatrioventricularvalves III. Openingofsemilunarvalves

A. Ionly

B. IandIIonly

C. IIandIIIonly

D. IIIonly

26. WhichisthecorrectstatementconcerningHIVandAIDS?

A. AllHIVpatientshaveAIDS.

B. HIVandAIDSaretransmittedonthesexchromosomes.

C. AllAIDSpatientshaveHIV.

D. HIVandAIDSneutralizeantibodies.

27. Howdoesthehypothalamusrespondtoaveryhighbodytemperature?

A. Increasesmusclecontraction

B. Stopsreceivingsensoryinput

C. Causesdilationofskinarterioles

D. Slowstheheartrate

28. WhatisacharacteristicoftypeIIdiabetes?

A. Insufficientinsulin

B. Insulininsensitivity

C. Excessglucagon

D. Lowwhitebloodcellcount

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29. Whichtwohormonespromotethickeningoftheendometrium?

A. FSHandLH

B. EstrogenandFSH

C. LHandestrogen

D. Progesteroneandestrogen

30. Whentheleftventricleisrelaxed,whatisthestateofthevalves?

Atrioventricular valve Semilunar valve

A. closed closed

B. closed open

C. open closed

D. open open