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8810-6004 13 pages
N10/4/BIOLO/SPM/ENG/TZ0/XX
Tuesday 2 November 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
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1.
2. Whatisthesequenceofstagesduringthecellcycle?
A. G1 S G2 mitosis cytokinesis
B. mitosis G1 G2 cytokinesis S
C. G1 G2 S mitosis cytokinesis
D. G1 G2 mitosis cytokinesis S
[Questionandimageremovedforcopyrightreasons]
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3. Thegraphbelowshowsthecorrelationbetweenthebiomassofamarineworm,Arenicola,andthepercentageoforganicnitrogeninthesandwhereitlives.
Biomass/gm–2
40
30
20
10
0.008 0.012 0.016 Percentageoforganicnitrogen
[ReproducedwithpermissionfromPJHayward"AnimalsofSandyShores"(1994)TheRichmondPublishingCo.Ltd.]
Whatstatementcanbemadefromthedata?
A. The increase in thebiomassof thewormisdue toan increase in thepercentageoforganicnitrogen.
B. There is no relationship between the biomass of the worm and the percentage of organicnitrogen.
C. The increase in the percentage of organic nitrogen is due to an increase in the biomass oftheworm.
D. Asthebiomassofthewormincreasessodoesthepercentageoforganicnitrogen.
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4. Whatisthedifferencebetweenthestructureofallprokaryotesandalleukaryotes?
Prokaryotes Eukaryotes
A. cellwall nocellwall
B. chloroplasts nochloroplasts
C. flagellum noflagellum
D. nucleoid nuclearenvelope
5. Whatdoesfacilitateddiffusionacrossacellmembranerequire?
A pore protein ATP A concentration gradient
A. yes no no
B. no no yes
C. yes no yes
D. no yes no
6. The graph below represents the amount ofDNAduring the cell cycle. Which part of the graphrepresentsmetaphase?
MassofDNA/pg
6
5
4
3
2
1
0
A.
B.
C.
D.
0 2 4 6 8 10 12 14 16 18 20 22 24 Time/h
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7. Whichdiagrambestillustratestheinteractionsbetweenwatermolecules?
A. H
O
H
O
HH
B.
H
O
O
HH
H
C.
H
O
H
H
H
O
D.
H
O
H
O
H
H
8. Whatchemicalreactionistakingplacewhenadipeptidebecomestwoaminoacids?
A. Condensation
B. Hydrolysis
C. Denaturation
D. Polymerization
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9. ThebaseratiosintheDNAandRNAforanonion(Allium cepa)aregivenbelow.
Bases A / % G / % C / % T / %
DNA 31.8 18.4 18.2 31.3
Bases A / % G / % C / % U / %
RNA 24.9 29.8 24.7 20.6
Whatisthereasonforthedifferencebetweenthesefigures?
A. DNAisonlyfoundinthenucleusbutRNAisfoundthroughoutthecell.
B. DNAismadeentirelyofdoublehelixbutRNAisnot.
C. InDNAbasesAandTarecomplementarybutinRNAbasesAandCarecomplementary.
D. RNAcomesinthreeformsbutDNAonlycomesinoneform.
10. Whichofthefollowingwillcauseanenzymetopermanentlyloseitsproperties?
I. Hydrolysis
II. Freezingto–20C°
III. Dissolvingitinwater
A. Ionly
B. IIonly
C. IandIIonly
D. IandIIIonly
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11. Whatislactaseusedfor?
A. Itisusedtomakesugar-freemilk.
B. Ithydrolyseslactosetoglucoseandfructose.
C. Itimprovesthedigestionofmilkbysomepeople.
D. Itdecreasestheacidityofthemilk.
12. Howcantherateofphotosynthesisofaplantbedirectlymeasured?
A. Bymeasuringtherateofoxygenproduced
B. Bymeasuringtherateofcarbondioxideproduced
C. Bymeasuringtherateofplantgrowth
D. Bymeasuringtherateoflightabsorbed
13. Whatdoesthenucleusofahumanlymphocytecontain?
A. Onlythegenestoproduceaspecificantigen
B. Onlythegenestoproducearangeofantibodies
C. Onlythegenesthatcontrolthegrowthanddevelopmentofalymphocyte
D. Thewholegeneticinformationforahuman
14. A cell in the testis of a male chimpanzee (Pan troglodytes) contains 48 chromosomes. It isabout to undergomeiosis. Howmanymolecules ofDNAwill be present in the nucleus of thespermcells justaftermeiosis?
A. 96
B. 48
C. 24
D. 12
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15. Whatischorionicvillussampling?
A. Samplingcellsfromtheplacenta
B. Samplingcellsfromthefetaldigestivesystem
C. Samplingfetalcellsfromtheamnioticfluid
D. Samplingstemcellsfromtheumbilicalcord
16. HowcanfragmentsofDNAbeseparated?
A. Usingpolymerasechainreaction(PCR)
B. Usinggelelectrophoresis
C. Usinggenetransfer
D. Usinggenecloning
17. Toproduceartificialerythrocytesforuseinbloodtransfusions,tobaccoplantshavebeengeneticallymodifiedtoproducehumanhemoglobin.Thefirstthreetripletsofthehumanhemoglobingeneare:
ATGGTGCAT
What would be the first three triplets of the hemoglobin gene inserted into the genome of themodified tobaccoplants?
A. TACGTGGTA
B. ATGGTGCAT
C. TACCACGTA
D. GCAACATGC
18. WhycanDNAprofilingbeusedtodeterminepaternity?
A. Genesofchildrenareexactlythesameastheirfather’s.
B. Halfthegenesofchildrenarethesameastheirfather’s.
C. Thefatherpassesonallofhisgenestoeachofhischildren.
D. Thefatherpassesonafractionofhisgenesequaltothenumberofhischildren.
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Questions 19 and 20 refer to the food web shown below.
bobcat
roadrunner
weaselgophersnake
opossum
quail
deermouse
chaparralplants
kangaroorat
meadowmouse
19. Whatisthetrophiclevelofthebobcatinthefoodwebabove?
A. Primaryandsecondarylevelconsumer
B. Secondaryandtertiarylevelconsumer
C. Tertiaryandquaternarylevelconsumer
D. Secondaryandquaternarylevelconsumer
20. Whatistheenergytransferlevelfromthekangaroorattotheweaselshowninthefoodwebabove?
A. Threetimesgreaterthantheenergytransferfromtheroadrunnertothebobcat
B. Halftheenergytransferfromchaparralplantstothemeadowmouse
C. Aquarteroftheenergytransferfromthequailtothebobcat
D. Approximatelythesameastheenergytransferfromthemeadowmousetotheopossum
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21. Whichofthefollowingwillpromotevariationinaspecies?
I. Meiosis
II. Fertilization
III. Naturalselection
A. Ionly
B. IIonly
C. IandIIonly
D. I,IIandIII
22. Whyhasantibioticresistanceevolvedinbacteria?
A. Allbacteriareproduceveryquickly.
B. Bacteriaexposedtoantibioticsdevelopedaresistancetothem.
C. Varietiesofbacteriaresistanttoantibioticsreproducefasterthannon-resistantvarieties.
D. Bacteriashowingresistancetoantibioticssurviveafterantibioticsareused.
23. WhatfeaturesdistinguishPlatyhelminthesfromAnnelida?
Platyhelminthes Annelida
A. segmentedbody non-segmentedbody
B. non-segmentedbody segmentedbody
C. bilateralsymmetry nobilateralsymmetry
D. nobilateralsymmetry bilateralsymmetry
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24. Whatistrueofthesource,productsandoptimumpHofthelipasefoundinthehumandigestivesystem?
Source Products Optimum pH
A. salivaryglands fattyacids 8
B. stomach starch 2
C. pancreas fattyacids 8
D. liver aminoacids 2
25. Whichchamberofthehearthasthethickestwalls?
A. Leftatrium
B. Rightatrium
C. Leftventricle
D. Rightventricle
26. Whatcausesairtobebreathedoutbythelungs?
A. Thediaphragmrelaxesandtheribsfall.
B. Theribsriseandtheexternalintercostalmusclesrelax.
C. Theinternalintercostalmusclescontractandtheribsrise.
D. Thediaphragmcontractsandinternalintercostalmusclescontract.
27. Whatcausestheformationofanerveimpulseonthepost-synapticmembrane?
A. Ca2+bindingwithareceptorsite
B. K+leakingintothepost-synapticmembrane
C. Neurotransmitterbindingwithreceptorsites
D. Neurotransmitterbeingremovedfromthesynapse
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28. WhatisthedifferencebetweentheoriginoftypeIandtypeIIdiabetes?
Type I Type II
A. causedbyanautoimmunereaction targetcellsfailtorespondtoinsulin
B. occursinadultsonly startsinchildhood
C. toomuchinsulinsecreted toolittleinsulinsecreted
D. causedbydietaryproblems causedbyhereditaryfactors
29. Thefollowingdiagramshowsthehumanfemalereproductivesystemasseenfromtheside.
I
II
[DiagramadaptedfromHumanReproductiveBiology,3rded,Jones&Lopez,AcademicPress,p.52.CopyrightElsevierLtd2006,usedwithpermission.]
WhatarethenamesoftheorganslabelledIandII?
I II
A. uterus vagina
B. bladder ovary
C. urethra oviduct
D. clitoris cervix
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30. ThehormonesprogesteroneandLHweremeasuredinawoman’sbloodover40days. Whendidhermenstrualbleedstart?
Key: progesterone LH
Progesterone/pgcm–3LH/ngcm–3
35
30
25
20
15
10
5
0
A. B. C. D.
0 5 10 15 20 25 30 35 40 Time/days