Cape Biology Unit 1 Mutiple Choice 2007

8/10/2019 Cape Biology Unit 1 Mutiple Choice 2007

1/12

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1.

CAPE Biology Unit Paper June 2 7

4.

The diligranl below shows the stru

atriglycrlde.

2.

One of the roles ofwatei'

in:J~~sUis

is~~~ffl~.~~ium

in blood.

Which of the ollo';ng

properties of

water

.acc:ountsfor this role?

A

(B)

High specific heat capacity

Strong cohesive forces between

molecules

High heat ofvaporisation

Solvent for

po r

molecules and ions .

.no

~

i

HC

X

-C

~

I

0

H

11-C

-

X

-C ~

I

0

II

e

x e

~

Which of the following represents

labelled X?

(A)

N

I

H

(B)

c

i

OH

C)

(0)

c

il

0

s.

The diagram below shows a

ring

structure of

glucose.

CLOH

j~

,

I

Which of the following correctly n

type of bond represented

by

the br

- in the diagram above?

A Ionic bond

(B) Hydrogen bond

(C) Hydrophobic bond

(0) OisuJphidebond

I

H

I

OR

Which of the following indicates the fonn of

glucose and in which molecule it is present?

f ~Vbe ~

,

j p.-esent

j Cellulose

iStarch

i Ceiiulose

I starch

glucose

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


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6. Food tests were carried out on four different solutions.

Which of the follow.ingcombinations shows the solutions that contained

only starch and sucrose?

Su ii~aUa

Biuret

Acid HytL-u ysis

Iodine in

- 1

hen Benedict:'s

Pota5shun

Test

Iodine

(A)

x

(B)

x

. . ,

x

I

e)

: II ; .

x

I

0)

x

x

.,

,

lit=negative result

.=

ositive result

7. Thefollowingisanelectron

znicrograpb of a section of' an animal cetl.

I V

(from

Advanced Biology -

Roberts.

p.44)

Which of the structures labelled I, n. nI and IV isconcerned with protein

synthesis?

(A) I

(B)

n

(C) III

(D) IV

45

III


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8.

Which of the

following

is NOT a

function of

the Golgi apparatus?

9

Whichof the following. labelled I to

r v .

give

the correct

site

where xylem tissue is found

ina diotyledonous stem?

(A)

(B)

..(C)

D)

Lipidsynthesis

Manufacture of'lysosomes

Packaging

of glycoproteins

Membrane formation

w. _ ~ .

A~lr----n

= f f i

(A) I

(8) Il

(C) III

(D) IV

L%-+---IV

Item 10

refers

to the following figure which shows four types of tis-sue in cross section.

M

N

o

10. Which of the following combinations

correctly identifies the phloem and xylem

tissues?

A

I)

p


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n.

W h i c h

of

th e

following

cell s

is represented,

1 3.

by th e

diagram

b elo w ?

(A) Neurone

(B) Plantcell

(C) B acteriu m

D) Sperm

12.

Which of the following identifies the

structure repr ese n ted by X in the diagram

be low ? . -

(A) Channelprotein

(B) Cholesterol

(C) Glycoprotein

(0) Extrinsicrotein

Four identical samples of plant tissue are

p laced in four different solutions. Each

sample of

plant

tissue has

a

w ater

potential

of 800 kPa. In which solution would full

plasmo ly sis occur \\it hi n t he ti ss ue ?

T oe soiution of

(A) - 300kPa

(B) - 500kPa

(C) - 800kPa

(D) -llOOkPa

14.

Which of the following pairs of statements

explains the mode of action of enzymes?

1. They are globular proteins and as

re s ul t a re s ol ub le.

II. Theybond to the substrate molecule

at their active sites.

Ill. They break down substrate

molecules int o products.

N.

T h ey lo w er th e ac ti va tio n e ne rgy to

th er ea cti o n .

(A) I andIIonly

(B) IIandill only

C ) n and IV only

(D) illand IV only


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l1an...l5 refers to the diagtam below which represents the activation energy for an enzyme-catalys

and

an un~teaction.

Progress of reaction (time)

15. The activation energy for an enzyme-catalysed

reaction is represented by the region labelled

(A) I

(B)

n

(C) In

(0) IV

16. Thegraphbelow shows the time course of the

activity of the enzyme sucrase at various

temperatures.

t

'Quaalily

t c ~ ~

Iprodud sr c

formed

v::

= Time

miD

60

At which of the following temperatures does the

enzyme work at the FASTEST rate?

(A) 10

O C

(B) 2S

C

(C) 37

C

(0)

600C


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49

17.

18.

~ refers to the diagram below which

shows atypical portion of the DNAmolecule

ofthe chromosome. i

Widthlmm

'vllich of the following

i~

1'.JOTrepresented

try the region labelled X?

(A)

(B)

(C)

Hydrogen bonds between base pairs

Two anti-parallel strands

Pyrimidine to pyrimidine base pairing

{Dj

Which of the following events occurs in

transcription aswell as inreplication of ONA?

(A)

(B)

(C)

0)

Free nucleotides bond to the DNA

strand.

Two new DNA molecules are

produced.

Uracil nucleotides bond toadenine on

the DNA strand.

Only part of the DNA molecule

containing agene unwinds.

19.

'Theamino-acid sequence

leucine-ly$ine-valiJle

occurs ina portionof apolypeptide molecule.

The table below shows the DNA codes for

these amino-acids.

IVallne

I

CA.J\

OAA

Transfer RNA molecules with anticodons

- needed for the synthesis of this polypeptide

lUe

(A)

(B)

(C)

0)

GAA

GAA

CUU

CUU

TIT

UUU

AAA

UUU

CAA

CAA

GUU

GUU

20.

One structure that may be observed in

animal cellsduring mitosis but isNOT se~n

in plant cells is

2

(A) spindle fibres

(B) centromeres

(C) centrioles

(D) chromatids

Which of the following statements correctly

describes homologous chro-oosomes?

L

II.

They are the same length.

They are held together by

centromere.

They m.v dle same gene loci.

They bave identical alleles.

HI.

IV.

(A)

(B)

(C)

D)

r, n

and

m

only

iandiUoniy

I, ill and IV only

rn

and IV only


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22.

Which of the following combinations

correctly represents the chronological order

of the events occuring in meiosis?

Item 24 refers to the diagram below whi

shows the longitudinal

section of part o

flower.

I-I---i

24. The micropyle and funicle are represent

by

(A)

(B)

(C)

(D)

I and V

II and V

ill and IV

IV and V

J

a. hromatid pairs line up at right-

angles to the equatorial plane.

Homologous chromosomes are

pulled apart

by

spindle fibres.

Chiasmata form

between

chromosomes of'the'bivalents,

Individual

chromatids

migrate to

poles,

Chromosomes

shorten and thicken

and appear as pairs of chromatids.

II.

III.

IV.

v.

(A)

(B)

(C)

(D)

I, III, IV, n,V

III, V, II.

r v

I

V, I. II,

m

IV

V , H I, I,

n

IV

Item 23 refers to the diagram below which

shows

a pollen grain,just

prlorto germination.

23.

A

a

diploid

tube

nucleus and

a

haploid

generative nucleus

(B) a

diploid

tube

nucleus and a diploid

generative nucleus which divides

into two gametes

(C)

a

haploid tube nucleus and a haploid

generative nucleus

(D) a haploid tube nucleus and a diploid

generative nucleus which divides

into two gametes


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5

The following diagram shows the formation

of gametes in a carpel of a flowering plant.

27.

One

feature

that

is

common to

both sperm,

(male gamete) and egg (female gamete), is

Flower [2n]

I

arpels

Embryo sac mother cells

I I l

~

Embl:1lO sac

(A) adiameter of approximately lOOIIDl

(8) the

abundance ofmitochondri ' .in

the

cytcpia ilm

(C) ahaploidnucleus

(0)

afoodstore

28.

The foliowing list represents some stages in

the p.:e5S of fecti.l.ization:

~

/


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o .

11w

colo ur

in a

certain

species of plant

n

b e

white, light pink or dark pink. There

two b y po theses to explain this:

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1tm..3l

below shows the inheritance of

recessive allele 'a' that causes a geneti

disorder which appears in the doubl

recessive

form., 'sa',

Hypothesis 1: There are two co-dominant

alleles.

n thesis 2: There are

t hr ee a ll el es ,

one

fo r

each flower

colour.

n 1 h y po theses ca n B E S T be te-sted

by

(A) analysing the flower pigments in

several different flowers using

chromatography to find out

whether someplants contain more 32.

than one pigment

(D)

controlling cross-pollination of

the

different varieties. in

all

possible

com b inations,

and recording the

co lo u rs S h o w n

by

ili~

I)ffspring

(C) controlling self-pollination of many

individuals of each colour variety

and recording the colours shown

y th e

ffspring

o f

each individJ 33.

pI

nt

sa m pl ed

() urv ying large wild populations

, nd o m ly an d findin g the ratios of

III d Iferent colour in these

u l 1I0M

31.

'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

(A)

B)

(C)

(D)

0.25

0.375

0.50

0.75

nr

I

~ --r---IO

3

4

5

6

2 ,

7

Which females are heterozygous f

the i so r er

(A) 30nly

(B) 5on.'y

(C) 3and 5 only

(D) 3,5 and 7

Which of the following does ~~OTcau

A ) . R csh U l 1 lin g o f genes

(B) M u t a tion s o f chromosomes

(C) Random fertilization

(D) Petrification of genetic material

34.

Which of the following increases the numb

of different alleles

ill

a population

organisms?

(A)

(B)

(C)

(D)

Crossing over

Gene mutation

Random fusion of gametes

Reassortment of chromosomes

meiosis


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35. Inthehereditary disease, sickle-cell anaemia.

the

amino acid, glutamic acid. found in

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 themutation. Which oCthefoUowing

would be the corresponding DNA nucleotide

responsible for the change?

(A)

(B)

(C)

(D)

CAA

CAT

CAU

CAG

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

themean weigbtwere grown under the same

circumstances as before. All the third

generation tubers were collected, weighed

and their mean weight calculated.

Compa.-ed to the second-generation tubers.

the third generation

tubers

have

(A) a greater mean

weight

and increased

genetic variation

(B)

a

greater mean weight. and

(C) an unchanged mean weight and

reducedgenetic variation

..(0) an unchanged mean weight and an

unchanged genetic variation

Animai.ia

Item 37 below shows the classification scheme for fOUTspecies of monkeys.

Choidata

.

r--. ~ I - - - - - - _

M.n; lia

I

Primates

I

I

Cercopithidae

I

Cenop\thegJS

-J iq25

greeu monkey

Co~us

I

Colobus badius

~

_l_Ir __ n

rye,=_

black _d wbite a)lobus

37. Which of

the above represents the genus to

which

the green monkey belongs?

(A) Mammalia

(8) Primates

(C) Cereopithidee

(0) Cercopithecus


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tre of the hypotheses in the theory of

nutur Iselection are:

r .

Individuals may differ from one

another as a result of chance

variation.

If.

More offspring are born than can

survive and reproduce.

III. There is a struggle for existence

between

the individuals

and

their

environment.

from these statements, which of the following

the MOST iikely deduction?

(A)

The number of individuals in the

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.

5

Ii)

( )

(0)

39.

Speciation is the process

by

which new

species

arise. Which TWO

of the following

ways, listed 1to IV, BEST promote this?

I.

Organisms

produce

large

numbers o

progeny.

A

local population

becomes

isolate

fr-om the main

'bulk

of th

population.

The isolated genome experiences

favourable

mutation.

The individuals in a

populations

a

iC-enticala.'X donotshowvariatiO ',S

in their cherecteristics,

i

III.

IV.

(A)

(B)

(C)

(D)

I and

rr

I and IV

nandm

Jl and IV

4 . (

idcr the following kingdoms:

I'ungi. Prokaryotes, Plants. Protoctists

tch EACH organism below

wit.~

the kingdoms above.

KINGDOMS

I

Protoctists

uo i Prokarvotes Plants

(B)

Breadmould I Bacterium

Moss

I

Breadmould Bacterium

Moss

I

Alga

Alga

largest

(A)

9)

( )

(0)

order class

phylum class

class order

phylum order

ph,yhun

order

phylum

class

(C)

Alga Moss

(0) I

Breadmould

I

Bacterium

. Which

of

the

following combinations

is the correct hierarchical sequence of the

taxonomic groups?


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Item 42 refers tothe 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 andIV

(C) II and III

(D) III and IV

43

in situ

conservation of an endangered

. ?

species.

of deforestation in tropical

areas?

(A) Destruction of tree; ~Jyatmospheric

(A)

(B)

(C)

(0)

Botanic garden

Sperm bank

Forest reserve

Seed bank

(B)

pollution

Replacement of native trees with

fast-growing species

Cutting trees

for timber

used in th

C)

0)

Dynamiting and other activites

involved

in

quarrying

for minerals

4.

Which of the following isNOT a conservation

aim when zoos are established?

A

Species canbe bred

in

captivity

and

then re-introduced into theirnaturaJ

habitat

(B)

Species can

be

kept

in

conditions

favourable for breeding

(C)

Species are protected from their

natural predators

(D)

Species held incaptivity may inbreed

Documents

Cape Biology Unit 1 Mutiple Choice 2007