Biology Higher Level Paper 1

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M09/4/BIOLO/HPM/ENG/TZ1/XX+

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Biology HigHer level PaPer 1 Wednesday 6 May 2009 (afternoon) 1 hour 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.

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18 pages © International Baccalaureate Organization 2009

2– 1. Whatdoesthefollowingscattergraphshow? 16 14 12 10 VariableY 8 6 4 2 0 0 2 4

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6 8 10 12 14 16 VariableX

A. B. C. D.

Nocorrelationbetweenthesevariables Strongpositivecorrelationbetweenthesevariables Strongnegativecorrelationbetweenthesevariables Weaknegativecorrelationbetweenthesevariables

2.

Whatconditionsmustbemetforthet-testtobeapplied? A. B. C. D. I. II. Populationsampledmusthaveanormaldistribution Variablemeasurediscontinuous

III. Samplesizemustbe>30 Ionly IIandIIIonly IandIIonly I,IIandIII

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3– 3.

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Howdoesthesurfaceareatovolumeratiochangewithanincreaseincellsize? A. Surfacearea/ volume B. Surfacearea/ volume

C. Surfacearea/ volume

Cellsize D.

Cellsize

Surfacearea/ volume

Cellsize

Cellsize

4.

Howdoprokaryoticcellsdivide? A. B. C. D. Bymitosis Bymeiosis Bybudding Bybinaryfission

5.

Whatcantheextracellularmatrixofcellsbemadeof? A. B. C. D. I. II. Polysaccharide Glycoprotein

III. Phospholipid Ionly IandIIonly IIandIIIonly I,IIandIII Turn over

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4– 6.

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Duringwhichphaseofthecellcycledochromosomesduplicate? A. B. C. D. G1 S G2 Mitosis

7.

Whichdiagramrepresentsthepolarityofawatermolecule? A. H

+
O H

B. H

−
O H


C.



 −
H




D.

+

+ −
O

O

O

H

H

+

+

−

+

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5– 8.

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InthemodeloftheDNAmoleculeshownbelow,whicharrowspointtocovalentbonds?

IV

I II

III A. B. C. D. I,IIandIIIonly II,IIIandIVonly I,IIIandIVonly I,IIandIVonly

9.

Whathappensduringthepathwayofglycolysis? A. B. C. D. Glucoseisbrokendownintopyruvate. Carbondioxideisproduced. MoreATPisconsumedthanisproduced. Lacticacidisproduced.

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Turn over

6– 10. Whatislightenergyusedforduringphotosynthesis? A. B. C. D. Toproducecarbondioxide Toproducewatermolecules ToproduceATP Tobreakdownsugarmolecules

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11. Red-green colour blindness is a sex-linked condition. Which of the following always shows normalvision? A. B. C. D. Ahomozygousmale Ahomozygousfemale Aheterozygousmale Aheterozygousfemale

12. In a cross between red haired cattle and white haired cattle the offspring produced are always a colour called roan (light red). If the roan cattle are interbred they produce white, roan and red offspring. Howmanyallelesarecontrollingthischaracter? A. B. C. D. 1 2 3 4

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7

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13. What evidence is given in the pedigree chart below to establish that the condition is caused by a dominantallele? Key: unaffectedmale

affectedmale unaffectedfemale affectedfemale

A. B. C. D.

Twounaffectedparentshaveunaffectedchildren. Twoaffectedparentshaveaffectedchildren. Anaffectedparentandanunaffectedparenthaveaffectedchildren. Twoaffectedparentshaveanunaffectedchild.

14. What conclusion can...
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