2018_bio_olevel_mj_paper1

Extracted Content: 2018_bio_olevel_mj_paper1

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Sener 5s
“goomonre Meas rsens

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Advaneed Level

BIOLOGY 9190/1
PAPER | Multiple Choice
JUNE 2018 SESSION 1 hour

Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)

TIME 7 hour

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told te do so.

Write your name. centre number and candidate number on the answer sheet in the spaces provided
unless this has already been done for vou.

There are forty questions in this paper. Answer all questions. For cach question there are four
possible answers. A,B,C and B. Choose the one vou consider correct and record your chotce in
sort pencil on the separate answer sheet

Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

Rach correct answer will score one mark. A mark will not be deducted fora wrong answer. i

This question paper consists of 10 printed pages and 2 blank pages.

Copyright. Zimbabwe School Examinations Couueil, 12018.

SZIMSECIIIS [Turnover }

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6

Which process uses ATP in transporting substances across membranes?

A endocytosis

B osmosis

C diffusion

D facilitated diffusion

‘The resolution of a light microscope is small because the radiation used has

A a lot of energy.

B a longer wavelength.
C

D

a shorter wavelength.
little energy.

Which organelle is present in eukaryotic cells only?

A cell wall

B endoplasmic reticulum:
Cc mesosome

Db 70S ribosome

An enzyme-seereling cell contains increased amounts of

A DNA.

B Golgi body.
Cc mitochondria.
D smooth ER.

Which starement is correct about the density of water?

A Density increases as temperature rises between O°C and 4°C,
BR Density increases as temperature decreases below O°C.

Cc The minimum density of water is at OPC.

D The minimum density of water is at 4°C.

A nucleoside consists of a

phosphate, a sugar and a base.
sugar and a base.

phosphate and a base.

sugar and a phosphate.

DOW.

OMT 1281S

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. enzyme . .
polypepude ——> amino acids

Which type of bond is broken dawn by the enzyme?

fe)
A
0
@
Bo —¢
Nou
R
i |
c -—cCH— oO
| |
R
|
D N-CH—

Curve Z represents the relationship between an enzyme and the concentration of its
substrate under optimum conditions and without an inhibiter.

Which curve. A, B, C or D represents the result when the same experiment is carried out
in the presence of a non-competitive inhibitor?

'

. eh
2 RK
neo

cen

subsirale concentrauion

SLM) J2G1S

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10

11

4

HIV causes host cells to produce a viral enzyme which breaks down polypeptide chains.

An ellective drug aguinst the viral enzyme must

be a non-competitive inhibitor for the enzyme.

be a compelilive inhibitor for all enzymes.

have a specific structure that inhibits only the viral ezyme.
inhibi, many types of viral enzymes.

Sore

‘The tollowing events occur during the cell evele.

i formation of mRNA

ii thickening cf chromosomes
iti pephide bond formation

Which of these events occur during interphase?

Fi iii and ti
B tand i

C Hand iil
D vand ii

The diagram shows a cell dividing by mitosis at metaphase.

How many DNA strands will be present al the end of telophase in each cell?

A 4
B &
Cc 12
dD 16

When preparing a root tp squash, the root tips are boiled in hydrochloric acid to

A break the middle lamella.

B fix the roots ips

Cc inhibit cel] division temporarily.

D remove the fixative from the root tips.

SPYON TAGES

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14

_
na

16

17

18

5

Which 1s true about the direction of the coding and non-coding strand of DNA?

<strong>. </strong>eoding strand | non-eoding strand _ |

A i 5' 3" v3 5! |
B 335" ae |
rc ane 8 |
iD SI 3 5 |

How many dillerent amino acids are coded for by a mRNA molecule with 21 nucleotides?

men

A
B
Cc
dD

te bo
ho

A coding strand of DNA has the sequence
TG CLA GCC
The complementing strand of mRNA with a single base substitution is
A ULC GUT CGA.
B AAC GAT CGA.
c AGC GAU CCGG.
D AAC GAU COG,

A transformed cell is one that

A can take in foreign DNA.
B changes structure after taking in foreign DNA.
Cc autcompetes other cells in mixtures of cells.

D has acquired foreign DNA.

he approximate length of a complete DNA molecule turn is

A 0.34 nm,
B 2 nm

Cc 3.4m.
D 10 nm.

The proportion of dominant to recessive characteristics in a population will remain the same
if

artificial selection takes place.
natural selection takes place.
the population is small.
random mating occurs.

COR Se

BEE IPOS

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20

lid
Ww

ina certain species of plants, the density of hairs on the lower epidermis of the leaf is
thought to be controlled by a single pair of alleles which are co-dominant.

What is the maximum number of different hair densities if the environmental factors have
no influence?

VOwer

td Qe

Bs

The graph shows the effect of the introduction ef potassium cyanide on the rate of
photosynthesis of Chloredla at different tight intensities.

untreated

rate of photosynthesis “—~ potassium cyanide treated

light intensity

What can be deduced from the graph?

A
B
C

D

Potassium cyanide inhibits photosynthesis at lower light intensities.
Potassium cyanide inhibits photosynthesis at higher light intensities.
Potassium cyanide has no inhibiting effect on photosynthesis at higher light
intensities.

Potassium cyanide absorbs more light at higher light intensities.

The first product of photosynthesis is

A
B
C

D

ATP
NADP
TP

GP

Which is not a feature of xylem?

A
B
Cc
D

lignified
sieve plate
narrow lumen
pitted

vido, | J2018

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24

Ww
Ht

What

GO wae

Which pathway(s) allow water to pass through the endodermis’?

A
B
c

D

are the changes that occur to a tree branch at a high rate of transpiration?

Merease i suction pressure increases and increase in diameter
ire and increase in diameter

se in Suction pressure and reducuion in the diameter
decrease in suction pressure and decrease in diameter

decrease in suction press:

increg

apoplast and vacuolar
apoplast and symplist

syaiplast only

ssmplast and vacuolar

7

[low many oxygen atoms can a red blood cell with 30 haemoglobin molecules carry?

A
B
C

Dd

ag
ot
120
20

The diagram shows an action potential

C
dD

Na’ gates open
K™ gates open
influx. oF KO
outlux of Na!

ee ~

sh event is oveurring at 37

SLOT a2

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8

What is the source of the pressure for the formation of glomerular filtrate in the kidney

nephron’?

A cardiac muscle in the left ventricle

B clastic tissue in the renal artery

Cc cardiac muscle im the right ventricle

D mitochondria in the cells of the Bowman's capsule

The diagram summarises the carbon cycle.

Which stage represents ingestion?

carbon dioxide
in atmosphere

carbon in producers

carbon in animals

carbon in dead animals

carbon in fossil fuels

In an ecosystem, which organisms are decomposers?

A earthworm

B beetles

C microorganisms
D snails

The diagram shows energy flow in a garden food chain.
At which staye is the energy transfer most efficient?

B

A . 2
sun-——————» cabbage —_=~——_» caterpillar —© > Sparrow

SPOT J2078

pe ecagle

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9

Inbreeding in plants is prevented by

4 divecity.

B protogy ny.

Cc protandrs .

D incompatibility.

Which hormone promotes root growth?

A abscisic acid

B gibberellic acid
Cc etlivlene

D auxin

During the menstrual evcle, which hormone is produced by the pituitary

gonadotrophin relcasing hormane?

N interstitial cel! stimulating hormone

B lutcinising hormone

Cc oustrogen

dD progesicrone

Uf fertilisation ofthe mammaiian ovum fails,
A the corpus luteum will nut disintegrate.
B progesterone secretion will increase.
Cc oestrogen secretion will inercase.

dD the primary follicle will not develop,

The diagram shows a typie

growth curve in bacteria,

During which stage is the number of cells doubling after each generation?

he

number of
cells i

GPa EER

ie

lite

vland in response to

[Purn over

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38

40

10

An isometric growth pattern is observed in

A ish.

B humans.
Cc tomatoes.
Dv nine wees.

Vhe followme changes occur in the ovary curing the menstrual evele.

ollicles develop

|

2 progesterone is produced
3 ovulation accurs

4 corpus luteum forms

Tn which sequence do these changes oceur?

A
B
Cc
dD

Algae is similar to plants because it

A is multice lular.
B contains chloroplasts.
C deteets and swims towares Helit.

D possesses a flagellum.

Using the binomial system. which of the following is the correct way of naming the Alrican
elephant?

A Tonoctoutar ufricune
B loxodorta Africana
Cc Lovedonta Africana
D Loxoddania african

Mosses are characterised by a dominant

A gametophyte with a cependent sporophyte
B gametophyle with an independent sporophyte
C sporophyte with an independent gametopbyte

b sporophyte with gametophyte reduced to a tew cells.

Sted EL

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