Gce o Level 2008 Biology 5094 5100 Paper 1 Solutions

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Page 1 of 

 

GCE O

# An1 A

2 A

3 D

4 D

5 B

6 C

7 C

8 C

9 B

10 D

11 B

12 A

13 B

14 C

 

Level Oct

ns WorkinXylem veand disso4 – riboso1 – protefrom memproducedActive traconcentraThereforethan that The greatFor bloodaround thFat (lipidDigestionpresence working Lacteal aHepatic pcontains Hepatic vglucose fPalisade cell in thesucrose, bEnzyme wtemperatuoptimumTranspira(in leavesWater vaCompaniprovide eAs tempeplant dowAs air gediffuses oCoronaryand dissosufficientmuscle co

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/Nov 2008

ngs/Remaressel is a holloolved mineral some on rough in products (sumbrane of golgd in the cell, anansport is a proation to a regioe, to absorb suboutside cell. test difference d to be pumpedhe body. d) is made up on of protein (e.of HCl, by thepH of protease

absorbs fatty acportal vein is thall the nutrientvein is the bloofrom the blood mesophyll (B)e leaf that is clbut not starch. works best at oure denatures e

m temperature, aation is the losss) and lenticels

apour moves thion cells functienergy for activerature increasewn. ets drier (lower out at a faster ry arteries carry olved nutrientst ATPs (due toould not work

 

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8 Biology 5

rks ow tube (absencsalts. endoplasmic re

uch as enzyme)gi bodies (3) wnd to secrete theocess by whichon of higher cobstance by acti

in concentratiod by the heart,

of one glycerol g. egg-white) t

e action of enzye is about that ocids and glycerhe blood vessets (such as glucod vessel that d

supply for its ) layer containslosest to the sun

optimum tempeenzyme. Thereand zero at higs of water vapos (in stem). hrough stomataioned to producve transport of es, rate of wate

r water potentiarate. blood to cardi

. If blood flowo the lack of ox

properly (coro

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5094/5100

ce of protoplas

eticulum is the) released from

whose purpose aese outside theh substances aroncentration, wive transport, c

on would requwater must be

and three fattytakes place in tyme protease. Tof HCl. rol. l that drains blcose) that havedrains blood frocellular energys the most numnlight. Phloem

erature. Low teefore, rate of regh temperature.our from the in

a via diffusion.ce ATP (by hav

f food substancer vapour loss

al), water vapo

iac (heart) musw is partially bloxygen and dissoonary heart dise

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0 Paper 1 S

sm) to allow fo

e site for proteim secretory vesare to modify ae cell. re transported f

with the expendconcentration in

ire the most enincompressibl

y acids molecuthe stomach, anTherefore, this

lood from digee been absorbedom liver, whichy production.

mber of chloropm (D) transports

emperature inaeaction is low a. nternal tissues i

ving a large nues in phloem sincrease, carry

ur in the leave

scle, supplying ocked, the cellsolved nutrientsease).

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Suggested

or ease of transp

n synthesis icle (2), which

and store chem

from a region oiture of energynside cell has t

nergy. le so that it cou

ules. n acidic enviros implies that o

stive system. Id from the smah would have t

plast because it s sugar in the f

activates enzymat low temperat

in plant throug

umber of mitocsieve tube cellsying latent heat

s (higher water

cardiac cells ws could not pros) and therefore

rights reserve

d Answers

port of water

h pinches off mical products

of lower y. to be greater

uld circulate

onment due to optimum

t therefore all intestine. taken up

is the layer of form of

me while high ture, highest at

gh the stomata

chondria) to s. t away to cool

r potential)

with oxygen oduce e the heart

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s

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15 C

16 D

17 C

18 B

19 A

20 C

21 C

22 C

23 A

24 B

25 D

26 C 27 B

28 C

29 B 30 C

Group B in the bodGroup O foreign su*AntigencharacterAt W, as closes to At X, semin aorta. At Y, sempressure At Z, leftthrough tZ: Enzym

Cell X copharynx. Diaphragincreaseslungs. ExcretionmetabolicDialysis diffuse oublood. Homeosteffector wWater copH in duoalkaline i Ciliary mto becomIris radiaprevents light-sensDorsal roRelay neuKidney isPollen grovule (4)Anthers mthe air whLight polGaseous One sperCell divis

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contains anti-Ady. contains anti-Aubstances in th

n maybe proteinrizing the bloodpressure in lefprevent backfl

mi-lunar valve

mi-lunar valve in left ventriclt ventricle is rethe opened bicume carbonic an

ontains cilia, w

gm muscle cons volume of tho

n is the removac waste producfluid flowing iut down the co

tatic control invwhich brings abontent in ileum odenum is kepintestinal juice

muscles contracme more convexal muscles relax

too much lightsitive retina fro

oot ganglion is uron is found is an osmoregulrains (male gam). must be held ouhen wind blowllen grains couexchange take

rm and one eggsion that occur

y exampape

A antibody, wh

A and anti-B ahe body. n, carbohydratd type. (i.e. Grft ventricle incr

flow of blood inopens as blood

closes as left ve) to prevent b

elaxed (low preuspid valve.

nhydrase cataly

which sweep du

tracts causing oracic cavity an

al of metabolicced by respiratin should not co

oncentration gr

volves a receptbout a correctiis dependent o

pt relatively con.

ct, reducing thex. x and circular mt from enteringom damage bycharacterized

in grey matter olatory and excr

metes) are foun

utside of flowews. uld be easily bloes place in placg fuse together rs in growth is

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hich would atta

antibodies, whi

te etc moleculeoup B containsreases due to cnto left atrium d flows into ao

ventricle starts backflow of bloessure), causing

yses this reactio

ust particles tra

the diaphragmnd decreases th

c waste production reaction inontain urea so radient, thus rem

tor which detecive measure, enon the volume nstant by mixtu

e tension in the

muscles contrag the eyes in ve strong light. structure of senof spinal cord.retory organ. nd in anther (1)

er so that polle

own away and centa.

to form a zygomitosis, which

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ack type A anti

ch would attac

e found on the ss type B antige

contraction of lfrom left ventr

orta from left v

to relax (as indood into left veg the blood to f

on.

apped in the mu

m to flatten and he pressure in t

ts from the bod cells. that urea frommoving waste

cts the change nsuring the conof water intakeure of acidic ch

e suspensory lig

act, reducing thery bright light

nsory neurons.

) and eggs (fem

en grains could

travelled a fur

ote. h produces gen

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igen as a foreig

ck type A and B

surface of red ben) eft ventricle, bricle. entricle, increa

dicated by decrentricle from aoflow from left

ucus up the trac

move downwathe lungs. Air f

dy. Carbon dio

m patient’s blooproduct from p

against the nornditions remaine. hyme from stom

gament and cau

he size of pupilt condition, pro

.

male gametes) a

be easily carri

rther distance a

etically identic

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B antigens as

blood cell,

bicuspid valve

asing pressure

reasing orta. atrium

chea into the

ards. This flows into the

xide is the

od would patient’s

rm and an n favourable.

mach and

using the lens

l. This otecting the

are found in

ied away in

away.

cal cells.

d.

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31 A

32 B

33 B

34 B 35 B

36 C

37 A

38 C

39 B

40 C

 3 

HomologrelativelyProphasemicroscoTelophasdaughter microscoGamete c

Prophasei) Biii) Ch

eaciii) Ge

chrMetaphasequatoriaof maternFertilizat

RestrictioDominanalleles arRecessivdifferent There is oon to the IA and IB

Blood groenvironmNatural sto continu2- Those maturity.3- Organ4- Differe6- SurvivIf flowerbe develoBats wouThe transheat, wasThereforeorganism

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gous chromosoy similar structue: Chromatin coope. se: Chromatidsnuclei. The ch

ope. contains a hapl

e I of meiotic dvalent formatio

hiasmata formach other makinenetic crossingromatids at these I of meiotic al plate of spindnal and paternation – fusion of

on enzyme cutsnt allele only mre present in thee allele only malleles are preonly one type ooffspring. are co-dominaoup and gende

mental factors. selection: Natuue in its survivorganisms tha

. nisms that survient organisms

val of the fittess were not polloped into fruit.uld be most affsfer of energy fste etc. e, an organism

ms from previou

y exampape

omes are a pair ures. ondenses and b

arrive at oppohromosomes di

loid set of chro

division – on – two homoation – non-sistng contact at seg over – the bree chiasmata, redivision – orie

dle is independal chromosomef sperm and eg

s DNA molecumeans the trait i

e same cell. means the trait i

sent in the samof allele (IA) pr

ant, while IO is rer are fixed at b

re selects thoseval and reproduat could not ada

ived reproducepossess differet. linated, fertiliz

fected as fruit ifrom one troph

m from successius trophic leve

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of chromosom

becomes visibl

osite poles of ceisperse and are

omosomes.

ologous chromter chromatids everal points (ceakage and rejosulting in exchentation of eacdent of other paes into daughtegg is a random p

ule at the restriit encodes is ex

it encodes is nome cell. resent in blood

recessive. birth. They do n

e organisms, wuction. apt to changing

e and pass on thent genes, and

zation would no

s its only food hic level to the

ive trophic level to achieve su

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mes, one from e

le as chromoso

ell and new me no longer visi

osomes paired of homologou

chiasmata) alonoining betweenhange of genetih homologous airs. (i.e. there

er cells) process

ction site into fxpressed in phe

ot expressed in

d group A hom

not change ove

which are better

g environment

he favorable getherefore diffe

ot take place. T

source. next decreases

el has to feed oufficient energy

r.com.sg. all r

each parent, tha

omes under the

embranes formible under the l

d up us chromosomeng their lengthn the two non-sic material pair of chromois independent

fragments. enotype when t

n the phenotype

ozygote. This w

er time due to v

r adapted to the

died before the

enes to their oferent adaptation

Therefore, ovar

s due to the los

on a large numby.

rights reserve

at have

light

m around the light

es twist around. sister

osomes on the t assortment

two different

e when two

will be passed

variation in

e environment

ey reach

ffspring. ns.

ry would not

ss in energy as

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