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CAPE Biology Unit 1 Paper 1 June 2007 1.
One of the roles ofwatei' in:J~~sUis
4.
is~~~ffl~.~~ium
in blood.
Which of the £ollo"';ng properties .acc:ountsfor this role?
of water
The diligranl below shows the structure of a triglycrlde.
~
.no
!!
i
!!
H-C(A) (B)
2.
I
High specific heat capacity Strong cohesive forces between molecules High heat ofvaporisation Solvent for polar molecules and ions .
11- C
I
e-
The diagram below shows a ring structure of glucose.
-C
X
-C
x
0 H 0 II
-e
~ ~ ~
Which of the following represents the bond labelled X?
ClLOH
j ~ ,
-
X
.
(A)
-N-
I H
I
(B)
-ci OH
I
I OR
H
Which of the following indicates the fonn of glucose and in which molecule it is present? glucose CI.
(C)
-0-
(0)
-cil
0
,
f ~Vbe!"~ j p.-esent j Cellulose iStarch Ceiiulose starch
s.
i I
This figure below is part 01" a growing polysacchlL-ide .ohain.
~
X
The name of the bond labelled X is
(A) (B) (C) (0)
glycosidic peptide hydrogen diester
Which of the following correctly names the type of bond represented by the broken line (-) in the diagram above? (A)
(B) (C)
(0)
Ionic bond Hydrogen bond Hydrophobic bond OisuJphidebond
--
-
(-
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6.
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Food tests were carried out on four different solutions. Which of the follow.ing combinations shows the solutions that contained only starch and sucrose? Su!ii~aUa
Biuret
Acid HytL-u!ysis
then Benedict:'s Test (A) (B) (e) (0)
.•.
" " :II;.
x
x
" x
Iodine in Pota5shun Iodine
&-1
x
..,
x
..•.
x
.,
'"
I
I
,
= negative result ."=positive result
lit
7.
The followingis an electronznicrograpb of"a section of' an animal cetl.
IV
III
(from Advanced Biology - Roberts.
Which of the structures labelled I, n. synthesis? (A) (B)
I
n
(C)
III
(D)
IV
nI and IV is concerned
p.44)
with protein
(-.
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8.
Which of the following is NOT a function of
the Golgi apparatus? (A) (B) ..(C) (D)
9.
Which of the following. labelled I to rv. gives the correct site where xylem tissue is found in a diotyledonous stem?
Lipid synthesis Manufacture of'lysosomes Packaging of glycoproteins
w._-~--.-! AI~.lr----n:
Membrane formation
--=-+---ffi L%--+---IV
(A) (8) (C) (D)
I Il III IV
Item 10 refers to the following figure which shows four types of tis-sue in cross section.
o
N
M
10.
Which of the following combinations correctly identifies the phloem and xylem tissues?
A
I)
p
(.~
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n.
Which of the following cells is represented, by the diagram below?
13.
Four identical samples of plant tissue are placed in four different solutions. Each sample of plant tissue has a water potential of 800 kPa. In which solution would full plasmolysis occur \\'ithin the tissue? Toe soiution of (A) (B) (C) (D)
14. (A) (B) (C) (D)
Neurone Plantcell Bacterium Sperm
Which of the following pairs of statements explains the mode of action of enzymes? 1. II.
12.
Which of the following identifies the structure represented by X in the diagram below? . -
- 300kPa - 500kPa - 800kPa -llOOkPa
Ill. N.
They are globular proteins and as a result are soluble. They bond to the substrate molecules at their active sites. They break down substrate molecules into products. They lower the activation energy tor
thereaction. (A) (B) (C) (D)
(A) (B) (C) (0)
Channel protein Cholesterol Glycoprotein Extrinsic protein
I and II only II and ill only and IV only illand IV only
n
l_.
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l1an...l5 refers to the diagtam and an un~teaction.
below which
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represents
the activation
energy
for an enzyme-catalysed
Progress of reaction (time)
15.
The activation energy for an enzyme-catalysed reaction is represented by the region labelled (A) (B) (C) (0)
16.
formed
In IV
The graph below shows the time course of the activity of the enzyme sucrase at various temperatures.
t 'Quaalily oIprodud
I
n
(t:c ~ ~ sr c
v:«: •
0=
Time! miD
At which of the following temperatures enzyme work at the FASTEST rate? (A)
(B)
10 OC 2S "C
(C)
37 "C
(0)
600C
60
does the
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~ refers to the diagram below which shows atypical portion of the DNA molecule of the chromosome. i
19.
'The amino-acid sequence leucine-ly$ine-valiJle occurs in a portion of a polypeptide molecule. The table below shows the DNA codes for these amino-acids.
Widthlmm
I Vallne
I CA.J\
IOAA
Transfer RNA molecules with anticodons - needed for the synthesis of this polypeptide lUe
(A) (B)
GAA
TIT
CAA
GAA
(C)
CUU CUU
UUU AAA UUU
CAA GUU GUU
(0) 20.
One structure that may be observed in animal cells during mitosis but is NOT se~n in plant cells is (A) (B) (C) (D)
17.
"'••1vllich of the following i~ 1'.JOTrepresented try the region labelled X? (A) (B) (C) {Dj
18.
Hydrogen bonds between base pairs Two anti-parallel strands Pyrimidine to pyrimidine base pairing
Which of the following events occurs in transcription as well as in replication of ONA ? (A) (B) (C)
(0)
Free nucleotides bond to the DNA strand. Two new DNA molecules are produced. Uracil nucleotides bond to adenine on the DNA strand. Only part of the DNA molecule containing a gene unwinds.
21.
spindle fibres centromeres centrioles chromatids
Which of the following statements correctly describes homologous chro-oosomes? L II.
HI. IV. (A) (B) (C)
(D)
They are the same length. They are held together centromere. They m.v€"dle same gene loci. They bave identical alleles.
r, n and m only iandiUoniy I, ill and IV only rn and IV only
by
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Item 24 refers to the diagram below which shows the longitudinal section of part of a
Which of the following combinations correctly represents the chronological order of the events occuring in meiosis? J
a.
II.
III.
Chromatid pairs line up at rightangles to the equatorial plane. Homologous chromosomes are pulled apart by spindle fibres. Chiasmata form between chromosomes
IV.
v.
flower.
of'the'bivalents,
I-I---i
Individual chromatids migrate to poles, Chromosomes shorten and thicken and appear as pairs of chromatids.
(A) (B) (C) (D)
I, III, IV, n, V III, V, II. I V, I. II, m, IV V, HI, I, n, IV
rv,
Item 23 refers to the diagram below which shows a pollen grain,just prlorto germination.
24.
23. (A)
a diploid tube nucleus and a haploid
(B)
a diploid tube nucleus and a diploid
(C)
generative nucleus which divides into two gametes a haploid tube nucleus and a haploid generative nucleus a haploid tube nucleus and a diploid
generative
(D)
nucleus
generative nucleus which divides into two gametes
The micropyle by (A) (B) (C) (D)
and funicle are represented
I and V II and V ill and IV IV and V
-
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15.
The following diagram shows the formation of gametes in a carpel of a flowering plant.
27.
Flower [2n]
I
•
(A) (8)
a diameter of approximately
(C) (0)
ahaploidnucleus af"oodstore
!
Embryo sac mother cells
I""Il
28.
~
The foliowing
list represents the p•. ":e5S of fecti.l.ization: I. IT.
~ Embl:1lO sac
~
Female gamete
I
IV
I
Spe;:mcontactsjelly coatof egg. Impenetrable surface.
(... ~) {B} (C) (D)
Which of the following correctly identifies the number of sets of chromosomes present at each numbered stage?
~
26.
(A) (B)
{C}
n
(0)
2n
n 2n 2n
2n n
!II n 2n
2n n
rv
(B)
(C) (D)
layer forms at egg
indicates the correct
t, n,
rv, ill III, I, II, IV IV, IT,I, III rv; m, II, I refers
to the simplified
dia~~m
below which sbows an embryo and ~~u:n...l';""·gm=nbrenes.
2!!
2n n 2n
!---....p,ar.;.'
u--....u'l
Which of the following identifies the structure which provides nourishment for the spennproducing cells in the testes? (A)
enzymes.
IV.
Which of the following order oftbese stages?
Fused polar nuclei
o
Acrosome releases Sperm enters cell.
some stages in
ill.
"<,...
,/
I 2n 2n
lOOIIDl the abundance ofmitochondri!'!.in the cytcpia'ilm
Carpels
/
One feature that is common to both sperm, (male gamete) and egg (female gamete), is
Embryo
Seminiferous tubule Sertoli cell Interstitial cell Connective tissue 29.
The region which functions in protecting the embryo from mechanical shock and injury is labelled (A) (B) (C) (D)
I II III IV
--
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o.
Hypothesis 1:
n 'n1 (A)
(D)
(C)
()
analysing the flower pigments in several different flowers using chromatography to find out whether some plants contain more than one pigment controlling cross-pollination of the different varieties. in all possible combinations, and recording the colours Shown by ·ili~I)ffspring controlling self-pollination of many individuals of each colour variety and recording the colours shown y the ffspring of each individ••"J nt
(D)
I
~!--r---IO 345
=' 6
32.
(A) (B) (C) (D)
33.
urv ying large wild populations , ndomly and finding the ratios of III d Iferent colour in these
0.25 0.375 0.50 0.75
Which females the disorder?
2, 7
are heterozygous
for
30nly 5on.'y 3 and 5 only 3,5 and 7
Which of the following does ~~OTcause
sampled (A) . (B)
(C) (D)
1I0M
'l'wo p rent, bolb of blood group A, have a 8011 of blood group A. Tho probability that their next child will have blood group 0 is
(C)
nr
hypotheses can BEST be te-sted by
ul
(A) (B)
recessive allele 'a' that causes a genetic disorder which appears in the double recessive form., 'sa',
There are two co-dominant alleles. There are three alleles, one for each flower colour.
thesis 2:
pI
31.
1tm..3l below shows the inheritance of a
11w colour in a certain species of plant n be white, light pink or dark pink. There two bypotheses to explain this:
34.
RcshUl'1ling of genes Mutations of chromosomes Random fertilization Petrification of genetic material
Which of the following increases the number of different alleles ill a population of organisms? (A) (B)
(C) (D)
Crossing over Gene mutation Random fusion of gametes Reassortment of chromosomes in meiosis
(_.
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In the hereditary disease, sickle-cell anaemia. the amino acid, glutamic acid. found in
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36.
In the Caribbean. sweet potato plants are propagated asexually by tubers, Twenty tubers collected from one plant were grown to produce 20 second-generarion plants. All the tubers from these second-generation plants were collected, weighed and their mean weight calculated. Twenty tubers closest to the mean weigbtwere grown under the same circumstances as before. All the third generation tubers were collected, weighed and their mean weight calculated.
normal haemoglobin. is substituted at a particular location by the amino acid valine. The codon
for glutamic
acid is QAA.
The
codons for valine can be either GUU. GUC or OUA. One single. ~ alone is changed during the mutation. Which oCthe foUowing would be the corresponding DNA nucleotide responsible (A) (B) (C) (D)
for the change?
Compa.-ed to the second-generation the third generation tubers have
CAA CAT
tubers.
CAU (B)
a greater mean weight and increased genetic variation a greater mean weight. and
(C)
an unchanged
(A)
CAG
..(0)
unchanged
Item 37 below shows the classification
mean
weight
and
reducedgenetic variation an unchanged mean weight and an genetic variation
scheme for fOUTspecies of monkeys.
Animai.ia !
Choidata
.r--.
~I------_, M.n ••;" ••lia !
I Primates I
I Cercopithidae I
Co~us Cenop\thegJS !!-J!iq25 greeu monkey 37.
I Colobus badius
Which of the above represents the genus to which the green monkey belongs? (A) (8) (C) (0)
Mammalia Primates Cereopithidee Cercopithecus
!
~
_l_Ir
__ .n = _ wbite a)lobus
rye,
black _d
(e.
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tre nutur
r.
of the hypotheses Iselection are:
in the theory
of
Speciation is the process by which new species arise. Which TWO of the following ways, listed 1to IV, BEST promote this?
39.
Individuals may differ from one another as a result of chance variation. More offspring are born than can survive and reproduce. There is a struggle for existence between the individuals and their environment.
If. III.
I.
Organisms produce large numbers of progeny. A local population becomes isolated fr-om the main 'bulk of the population. The isolated genome experiences a favourable mutation. The individuals in a populations are
iL III. IV.
iC-enticala.'X!donotshowvariatiO!',S
from these statements, which of the following the MOST iikely deduction?
(A)
Ii)
( )
(0)
4.
('"
in their cherecteristics,
rr
The number of individuals in the
(A)
I and
environment increases with each generation. The individuals best ;;uited to the environment' are those with the lea.stvariation. The individuals with variation are hybrids, sterile and are unsuccessful in the struggle. The individuals which cope with the struggle have variations suited to the environment.
(B)
I and IV nandm
(C) (D)
Jl and IV
idcr the following kingdoms:
I'ungi. Prokaryotes,
Plants. Protoctists
tch EACH organism
below wit.~ the kingdoms
above.
KINGDOMS Fuo!!i
(B)
Breadmould
(C)
Moss
1(0) •.
I Breadmould
Which of the following
(A) ( ) (0)
order phylum class phylum
class class order order
Prokarvotes
I Bacterium I Breadmould I Bacterium
combinations largest
(9)
!
ph,yhun order phylum class
Plants
Moss
I Protoctists I
Alga
Alga
Bacterium
Alga
Moss
is the correct hierarchical
sequence of the taxonomic
groups?
(-.
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Item 42 refers to the the diagrams below which illustrate a variety ofleaf shapes found in nature.
42.
Which of the leaves above would be grouped together in a classification scheme? (A)
land II
(B)
I and IV
(C) (D)
II and III III and IV
43. in situ conservation . ? species.
of an endangered
of deforestation (A)
(A) (B)
(C) (0)
Botanic garden Sperm bank Forest reserve Seed bank
(B) (C)
(0) 44.
Which of the following is NOT a conservation aim when zoos are established? (A)
(B) (C) (D)
Species can be bred in captivity and then re-introduced into theirnaturaJ habitat Species can be kept in conditions favourable for breeding Species are protected from their natural predators Species held in captivity may inbreed
in tropical areas?
Destruction of tree; ~Jyatmospheric pollution Replacement of native trees with fast-growing species Cutting trees for timber used in the Dynamiting and other activites involved in quarrying for minerals
