6030q1 Specimen paper

Extracted Content: 6030q1 Specimen paper

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ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Advanced Level

BIOLOGY 6080/1

PAPER 1 Multiple Choice

Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Electronic calculator and/or Mathematical tables

TIME 1 hour
INSTRUCTIONS TO CANDIDATES
Do not open this booklet until you are told to 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 you.

There are forty questions in this paper. Answer all questions. For each question there are four
possible answers, A, B, C and D. Choose the one you consider correct and record your choice in
soft pencil on the separate answer sheet.

Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this booklet.

This question paper consists of 13 printed pages and 3 blank pages.
Copyright: Zimbabwe School Examinations council, Specimen paper.

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70s ribosomes and circular DNA are found in

A chloroplasts.

B eukaryotic cytoplasm.

Cc rough endoplasmic reticulum.
D smooth endoplasmic reticulum.

Which organelle is prominent in most secretory cells?

A centriole
B golgi body
Cc endoplasmic reticulum

D vacuole
A lysosome measures 0.5m in diameter.

What is the diameter of the lysosome in nm?

A 5

B 50

Cc 500
D 5 000

The diagram shows the structure of a fluid mosaic model of the cell membrane.
In which one of the areas labelled A,B,C, or Ddo we find hydrophobic amino acids?

ns
He WW WY Hy

Which bond helps to decrease the fluidity of the cell surface membrane?

A C=0
B C-O
Cc C-C
D C=C

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Which property of water allows small animals to skate on water?

A adhesion

B cohesion

Cc high surface tension

D maximum density at 4°C

The diagram represents the relationship between the levels of protein structure.

Secondary .
structure Tertiary

Quaternary structure

Which number represents the primary structure of a protein?

Samer
emwnd

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4 8 The diagram shows the time course of an enzyme reaction for a bacterium found in a

hot spring.

Rate of
Reaction

Time in minutes

What is the optimum temperature of this enzyme?

A 25°C
B 37°C
Cc 72°C
D 80°C

9 The diagram shows an outline of the cell cycle.

At which stage does the cell synthesise more mitochondria?

A Gl
B G2
Cc M
D S

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10

11

4

5
At which stage of tumour development do cancerous cells migrate to other body organs?
A cytokinesis
B meiosis
Cc metastasis
D

mitosis

A ribosome has the following molecules except

A amino acids.
B nucleotides.
Cc phospholipids.
D nucleic acids.

InaDNA molecule the base sequence AGA codes for the amino acid serine.
What is the base sequence of the anti-codon on tRNA to which serine becomes
attached?

A ACU
B GAU
Cc TCA
D AGA

Transfer of recombinant DNA into Escherichia coli_needs

A heat treatment.
B Caci2 treatment.
Cc x-ray treatment.
D uv treatment.

Which cell type would not be a direct target for gene therapy?

A endothelial cell
B liver cell

Cc muscle cell

D red blood cell

In dihybrid test crosses what is the expected phenotypic ratio?

Wr rr

Sanr
OrRWrR
Or

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16

17

6
In a X?- test, null hypothesis Hy is supported when

X?* calculated > 0.5.
P (X? calculated) < 0.5
P ( X? calculated) > 0.5.
X? calculated < 0.5.

SOS

Which of the following genotypes is used to determine an unknown genotype?

A AaBb
B AABB
Cc aabb

D AaBB

The diagram shows the structure of a chloroplast.

Which labelled part A, B, C or Dis responsible for the production of NADPH?
A

NN

Which of the following is a product of cyclic photophosphorylation?

A NADPH,
B ATP

Cc TP

D oxygen

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7 20 ~The diagram summarises a stage in aerobic respiration.

2acetyl co A

How many molecules of CO, are formed when molecule Y is converted to X

Sowr
aAkwWh

21 ~ ~Whatis the effect of increasing oxygen around ribulose bisphosphate carboxylase
oxygenase (RUBSCO)?

A increased production of RuBP
B increased production of GP
Cc reduced production of COz

D reduced production of TP

22 ~~ Which one of the following is not a function of the Casparian strip?

to block the apoplast pathway.
to block movement of water from xylem.
to block the symplast pathway.
to block the vacuolar pathway.

Somer

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8

23 The diagram shows transportation of substances in vascular tissue.

Which letter A, B, C or Drepresents capillary action?

«== B Source

Mm OO

Sink

24 The diagram shows the cross section of an artery.

Which part A, B, C or Dallows the artery to stretch without bursting?

D

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9

The diagram shows a cholinergic synapse.

X

Qe
@
2)
Or
Direction of
impulse
What is contained in X?
acetylcholinesterase
neurotransmitter

calcium ions
sodium ions

Somer

The graph shows membrane potentials recorded from squid axons bathed in water samples
with different sodium ion concentrations.

Which of the axons is bathed in water with the highest sodium concentration?

80
60
40
20
0
-20
-40
-60
-80

Membrane potential/mV

Time/ms

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10 The diagram shows active and passive movement of ions through a nerve membrane at rest.

Which arrow A, B,C or Dshows the correct movement of ions?

Inside of cell Nat
; Cc
se]
ol 5 TP
Plasma
Membrane | A B * ADP +P
at (1)
x
*
vy x D
Kt Nat Kt
Outside of cell

Double fertilisation in plants means that

A two male gametes fuse with two female gametes.

B two pollen grains germinate at the same time and fertilise two female
gametes.

Cc one male gamete fuses with the ovum and another fuses with the
diploid nucleus in the embryo sac.

D one male gamete fuses with the ovum and the pollen tube nucleus in
the embryo sac.

Spermatogenesis and oogenesis are similar in that

both processes start as from puberty.

primary spermatocytes and primary oocytes are haploid cells.

four gametes are produced in each case from one gamete mother cell.
germinal epithelial cells multiply before maturing into gamete mother
cells.

Sone,

Fertility drugs used in the IV F technique to stimulate ovaries may contain

A LH.

B FSH.
Cc GH.
D GnRH.

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31 The diagram shows a cross section of an anther.

Which labelled part A, B, C or D contains haploid cells?

32 Ecology can be defined as the study of

the environment.

communities .

a community of organisms and their behaviour.

the relationship between living organisms and their environment.

Samer

3 Two different bird species which do not compete for resources occupy

different niches in the same ecosystem.
different niches in the same habitat.
the same niche in the same ecosystem.
the same niche in a different habitat.

Sone,

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2p

34 ~The diagram shows the effect of organic discharge on the oxygen content of river water.

Which graph A, B, C or Dindicates the highest level of eutrophication?

100% +
Dissolved
oxygen
B
Cc
D
0

Distance downstream

35 Which feature is not found in prokaryotes?

A plasmids

B ribosomes

Cc flagella

D cellulose cell wall

36 ~~ Which of the following shows importance of bacteria only?

A food spoilage

B manufacture of human hormones
Cc disease causing

D recycling of nutrients in ecosystems

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B

Alcohol is considered as a socially acceptable drug in many communities because

it is non-addictive.

itis taken as a mood altering drug.

fewer people die from alcohol related diseases.
when taken in moderation it has few adverse effects.

Sone,

Physical dependence on a drug occurs when it is

A needed in metabolism.

B needed to attain a state of euphoria.
Cc taken in larger doses.

D implicated in social problems.

What is the role of T cells in immunity?

A to release antibodies
B to produce cytokines
Cc to offer non specific immunity
D to secrete compliment proteins

A fter taking one unit of alcohol, blood alcohol concentration (BAC) in men is about

15mg100cm~? and in women it is about 25mg100cm-°.

This difference is due to the fact that

generally men have a larger liver.

women have less alcohol dehydrogenase.

men have smaller quantity of water in their bodies.
women have a higher BMR compared to men.

Sonar

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