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
2210-6016
–2– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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.
2210-6016
–3–
Turn over
M10/4/BIOLO/SPM/ENG/TZ2/XX+
4. Thediagrambelowshowsabacterium.
X
WhatstructuredoesthepartlabelledXidentify?
A. Nucleus
B. Nucleoid
C. Nucleolus
D. Nuclearmembrane
5. Whatdoprokaryoticcellshavethateukaryoticcellsdonot?
A. Mitochondria
B. 70Sribosomes
C. Histones
D. Internalmembranes
2210-6016
–4– M10/4/BIOLO/SPM/ENG/TZ2/XX+
6. WhathappensduringtheG2stageofinterphase?
A. Homologouschromosomespair
B. Synthesisofproteins
C. Homologouschromosomesseparate
D. ReplicationofDNA
7. Whatisaroleofsulfurinlivingorganisms?
A. Formationofproteins
B. Formationofcarbohydrates
C. Formationofteeth
D. Transmissionofnerveimpulses
2210-6016
–5–
Turn over
M10/4/BIOLO/SPM/ENG/TZ2/XX+
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
2210-6016
–6– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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
2210-6016
–7–
Turn over
M10/4/BIOLO/SPM/ENG/TZ2/XX+
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.
2210-6016
–8– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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%
2210-6016
–9–
Turn over
M10/4/BIOLO/SPM/ENG/TZ2/XX+
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
2210-6016
–10– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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.
2210-6016
–11–
Turn over
M10/4/BIOLO/SPM/ENG/TZ2/XX+
20. Whichorganisminthisfoodwebisbothasecondaryandtertiaryconsumer?
A. Largecrab
B. Smallherbivorousfish
C. Shark
D. Microscopicplanktonicalgae
21. Whichgaswillenhancethegreenhouseeffectifreleasedintotheatmosphere?
A. Hydrogen
B. Oxideofnitrogen
C. Oxygen
D. Nitrogen
2210-6016
–12– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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.
2210-6016
–13–
Turn over
M10/4/BIOLO/SPM/ENG/TZ2/XX+
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
2210-6016
–14– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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
2210-6016
–15– M10/4/BIOLO/SPM/ENG/TZ2/XX+
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
