Monday 17 May 2010 (afternoon) INSTRUCTIONS TO …

2210-6010 17 pages

M10/4/BIOLO/SPM/ENG/TZ1/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 0

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1. The lengthsofa sampleof tigercaninesweremeasured. 68%of the lengths fellwithina rangebetween15mmand45mm.Themeanwas30mm.Whatisthestandarddeviationofthissample?

A. 5mm

B. 15mm

C. 7.5mm

D. 30mm

2. Whichfunctionsoflifearefoundinallunicellularorganisms?

A. growth,responseandnutrition

B. differentiation,responseandnutrition

C. metabolism,meiosisandhomeostasis

D. growth,metabolismanddifferentiation

3. Whichstatementispartofthecelltheory?

A. Cellsarecomposedoforganicmolecules.

B. CellshaveDNAastheirgeneticmaterial.

C. Cellshavecytoplasmsurroundedbyamembrane.

D. Cellscomefrompre-existingcells.

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4. Whichofthefollowingarefeaturesofprokaryotesandeukaryotes?

70S ribosomes 80S ribosomes Naked DNA DNA associated with proteins

A. prokaryote eukaryote prokaryote eukaryote

B. eukaryote prokaryote eukaryote prokaryote

C. eukaryote prokaryote prokaryote eukaryote

D. prokaryote eukaryote eukaryote prokaryote

5. Whatrouteisusedtoexportproteinsfromthecell?

A. Golgiapparatus→roughendoplasmicreticulum→plasmamembrane

B. Roughendoplasmicreticulum→Golgiapparatus→plasmamembrane

C. Golgiapparatus→lysosome→roughendoplasmicreticulum

D. Roughendoplasmicreticulum→lysosome→Golgiapparatus

6. WhicheventsoccurduringtheG1phaseandSphaseofthecellcycle?

G1 phase S phase

A. DNAreplicates cellgrows

B. mitosisbegins celldivides

C. celldivides mitosisbegins

D. cellgrows DNAreplicates

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7. Whichsubstanceinprokaryotescontainssulfur?

A. DNA

B. Phospholipids

C. Proteins

D. Antibiotics

8. Whichdescribesthesemoleculescorrectly?

I.

II.

I II

A. ribose aminoacid

B. glucose aminoacid

C. ribose fattyacid

D. glucose fattyacid

C O

CH2OH

HC

C C

COH

H

H

OH

H

OH

H

OH

O

C

OH

(CH2)nCH3

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9. WhatsequenceofprocessesiscarriedoutbythestructurelabelledXduringtranslation?

X

UACA U G C C G U A C G A U C

A. Combiningwithanaminoacidandthenbindingtoananticodon

B. Bindingtoananticodonandthencombiningwithanaminoacid

C. Bindingtoacodonandthencombiningwithanaminoacid

D. Combiningwithanaminoacidandthenbindingtoacodon

3′ 5′

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10. Thediagrambelowshowsabiochemicalpathwayinayeastcell.Whichofthefollowingcorrectlyidentifiesacompoundinthediagram?

A. Iisfat.

B. IIispyruvate.

C. IIIislactate.

D. IViscarbondioxide.

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11. ThefollowingdiagramshowsashortstretchofDNA.WhatbasesareindicatedbylabelsYandZ?

Y Z

A. thymine adenine

B. thymine guanine

C. uracil guanine

D. uracil adenine

12. Aplantisexposedtoincreasinglightintensityfromverydimtobrightlight,whilethecarbondioxideconcentrationandtemperaturearekeptatanoptimumlevel.Whatwillhappentotherateofoxygenproduction?

A. Itwillincreaseexponentially.

B. Itwillremainconstant.

C. Itwilldecreasetoaminimumlevel.

D. Itwillincreasetoamaximumlevel.

Y

Z

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13. Insomepeople,hemoglobinalwayscontainstheaminoacidvalineinplaceofaglutamicacidatonepositionintheprotein.Whatisthecauseofthis?

A. Anerrorintranscriptionofthehemoglobingene

B. AnerrorintranslationofthemRNA

C. Lackofglutamicacidinthediet

D. Abasesubstitutioninthehemoglobingene

14. Whatisasuspectedheterozygousindividualcrossedwithinatestcross?

A. Homozygousdominant

B. Homozygousrecessive

C. Heterozygousdominant

D. Heterozygousrecessive

15. Whatarehomologouschromosomes?

A. Identicalchromosomes

B. Non-identicalchromosomeswithdifferentgenes

C. Non-identicalchromosomeswiththesamegenesinthesamesequencebutnotnecessarilythesamealleles

D. Non-identicalchromosomeswiththesamegenesinadifferentsequenceandnotnecessarilythesamealleles

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16. WhichprocessesinvolvedincloningananimalareindicatedbythelettersXandY?

X

Y

Organism to be cloned

Clone is bornNucleus removed

Begins to develop as an embryo

Implanted into a female sheep

X Y

A. differentiatedcellremovedfromanimal nucleus removed from unfertilizedeggcell

B. sexcellremovedfromanimal nucleus removed fromdifferentiatedanimalcell

C. sexcellremovedfromanimal nucleus removed from unfertilizedeggcell

D. differentiatedcellremovedfromanimal nucleus removed fromdifferentiatedanimalcell

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17. Whattypeofinheritanceisshowninthispedigreechart?

Key:

Affected

Carrier

A. X-linkeddominant

B. Y-linkeddominant

C. X-linkedrecessive

D. Y-linkedrecessive

18. Whatisacommunity?

A. Agroupoforganismslivingandinteractinginthesametrophiclevel

B. Agroupofpopulationslivingandinteractinginafoodchain

C. Agroupoforganismsofthesamespecieslivingandinteractinginanecosystem

D. Agroupofpopulationslivingandinteractinginanarea

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19. Whataretheunitsofapyramidofenergy?

A. kJmyr

B. kJmyr

C. Jms

D. Jms

20. WhatisapotentialconsequenceoftheriseinglobaltemperaturesontheArcticecosystem?

A. IncreasedexposuretoUVlight

B. Increasedrateofdecompositionofdetritus

C. Decreasedsuccessofpestspecies

D. Increaseintheicehabitatavailabletopolarbears

21. Whatcanlimitincreasesinpopulationsize?

I. Decreaseinprey II. Decreaseinparasites III. Increaseinpredators

A. IandIIonly

B. IandIIIonly

C. IIandIIIonly

D. I,IIandIII

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22. Whichofthefollowingareusedasevidenceforevolution?

I. Homologousstructures II. Selectivebreedingofdomesticatedanimals III. Overproductionofoffspring

A. IandIIonly

B. IandIIIonly

C. IIandIIIonly

D. I,IIandIII

23. ApoodleandachihuahuaarebothdogsandclassifiedasCanis familiaris.Whatconclusioncanbemade?

A. Theybelongtothesamegenusbutnotthesamespecies.

B. Theyarethesamespeciesbutnotthesamegenus.

C. Theyaredifferentspeciesbutcaninterbreed.

D. Theybelongtothesamegenusandarethesamespecies.

24. Whichofthefollowingiscorrectforlipase?

Substrate Source pH optimum

A. triglycerides pancreas pH=8

B. fattyacids smallintestine pH=7

C. triglycerides smallintestine pH=9

D. fattyacids pancreas pH=9

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25. Whatprocessesoccurduringassimilationandabsorptionoflipids?

Assimilation Absorption

A. lipids are broken down byenzymes

lipidsareegested

B. lipids are incorporated intonewmembranes

lipidspassintothelacteal

C. lipidspassintothelacteal lipids are incorporated intonewmembranes

D. lipidsareegested lipids are broken down byenzymes

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26. Thediagrambelowshowsthehumanheart.WhatstructuresareindicatedbythelabelsX,YandZ?

X

Z

Y

[Source:adaptedfrom:http://whyfiles.org/102spareparts/images/heart2.gif]

X Y Z

A. leftatrium aorta semi-lunarvalve

B. leftatrium aorta atrio-ventricularvalve

C. rightatrium pulmonaryartery atrio-ventricularvalve

D. rightatrium pulmonaryartery semi-lunarvalve

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27. WhataretwoeffectsofHIVontheimmunesystem?

A. Reductioninantibodyproductionandincreaseinactivelymphocytes

B. Increaseinantibodyproductionanddecreaseinredbloodcells

C. Reductioninantibodyproductionanddecreaseinactivelymphocytes

D. Increaseinantibodyproductionandincreaseinredbloodcells

28. WhatisthefunctionofthestructurelabelledX?

[Source:adaptedfromhttp://www.medicalook.com/systems_images/lungs.gif]

A. Gasexchange

B. Ventilation

C. Respiration

D. Inspiration

X

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29. WhatarecausesoftypeIandtypeIIdiabetes?

Type I Type II

A. autoimmune disease leading toreducedinsulinsecretion

decreased responsiveness of thebodytoinsulin

B. decreased responsiveness of thebodytoinsulin

autoimmune disease leading toreducedinsulinsecretion

C. increased responsiveness of thebodytoinsulin

autoimmune disease leading toincreasedinsulinsecretion

D. autoimmune disease leading toincreasedinsulinsecretion

increased responsiveness of thebodytoinsulin

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30. Inthediagramofsynaptictransmissionbelow,whatisindicatedbythelettersXandY?

Synapticcleft X

Postsynapticmembrane

Y

X Y

A. neurotransmitterenterssynapticknob Ca2+ions

B. Ca2+ionsdiffuseintothesynapticknob neurotransmitter

C. K+ionsdiffuseintothesynapticknob neurotransmitter

D. Na+ionsdiffuseintothesynapticknob Ca2+ions

Monday 17 May 2010 (afternoon) INSTRUCTIONS TO …

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