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