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ZIMSEC A Level · 6030/1 · N2022

Biology Paper 1 November 2022

Questions
40
Syllabus code
6030/1

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Questions
40
Pass mark
24
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

cell membranes
What is the function of glycoproteins in cell membranes?
  1. Acontrol membrane fluidity
  2. Btransport molecules across the membrane
  3. Crecognition sites for antigens
  4. Dbarrier to most molecules

Question 2

microscopy
Which statement, about resolution, is not true?
  1. AIncreases depth of detail of specimen.
  2. BIncreases with decrease in wave length.
  3. CIs higher in light microscopes.
  4. DIs higher in electron microscopes.

Question 3

microscopy and magnification

In a calibrated eyepiece graticule, a single division measures 2.5μm.

What is the size of the nucleus of the cell shown in the diagram?

  1. A7.5μm
  2. B15μm
  3. C92μm
  4. D230μm

Question 4

lipids

The diagram shows the structure of a biological molecule.

What is bond P?

  1. Aester
  2. Bpeptide
  3. Cglycosidic
  4. Dphosphodiester

Question 5

enzymes
Biological washing powders are more effective at
  1. Awarm temperature.
  2. Blow pH.
  3. Chigh pH.
  4. Dcold temperature.

Question 6

enzymes
Which statement is true for all enzymes?
  1. Athey are affected by competitive inhibitors
  2. Bthey are part of catabolic reactions
  3. Cthey are coded for by DNA
  4. Dthey are active inside cells

Question 7

mitosis

A parent cell dividing by mitosis had 14 chromosomes.

How many chromosomes will each daughter cell have after mitosis?

  1. A7
  2. B14
  3. C21
  4. D28

Question 8

meiosis

The graph shows the amount of DNA in a cell during meiosis.

Which stage is represented at time X?

  1. Aanaphase I
  2. Banaphase II
  3. Ctelophase I
  4. Dtelophase II

Question 9

DNA replication

A culture of DNA containing the N¹⁴ isotope was grown in a medium containing the heavy N¹⁵ isotope.

What is the percentage of the N¹⁵ in the second generation.

  1. A25%
  2. B50%
  3. C75%
  4. D100%

Question 10

DNA replication
Which pair of enzymes are involved in DNA replication?
  1. Aligase and endonuclease
  2. Bhelicase and polymerase
  3. Cpolymerase and endonuclease
  4. Dhelicase and endonuclease

Question 11

nucleic acids

A section of DNA was analysed and 24% of its bases was adenine.

How much of the DNA was cytosine?

  1. A24%
  2. B26%
  3. C52%
  4. D76%

Question 12

inheritance
The condition in which two alleles equally express themselves in the phenotype is
  1. Asex linkage.
  2. Bco-dominance.
  3. Ccomplete dominance.
  4. Dmultiple allelomorphism.

Question 13

inheritance

A girl is blood group B and her brother is blood group A.

Which combination of genotypes cannot belong to their parents?

father, mother
A: IᴮI⁰, IᴬIᴬ
B: IᴬIᴮ, IᴬIᴮ
C: I⁰I⁰, IᴬIᴮ
D: IᴮI⁰, IᴬI⁰

  1. AA
  2. BB
  3. CC
  4. DD

Question 14

respiration
How many carbon dioxide molecules are released for one complete turn of the Krebs cycle?
  1. A2
  2. B4
  3. C6
  4. D8

Question 15

photosynthesis

The diagram shows the structure of a chloroplast.

In which part, A, B, C or D, is reduced NADP oxidised?

  1. AA
  2. BB
  3. CC
  4. DD

Question 16

respiration
Which substance acts as the hydrogen acceptor in animals under anaerobic conditions?
  1. Aethanal
  2. Bcoenzyme A
  3. Cpyruvate
  4. Dlactate

Question 17

transport in mammals

The following statements describe a blood vessel.

no semi-lunar valves (except where it leaves heart)
transports blood away from the heart
thick tunica media
high blood pressure

Which blood vessel best suits the description?

  1. Avein
  2. Bartery
  3. Ccapillary
  4. Dvenule

Question 18

disease
Coronary heart disease is least prevalent in
  1. ASub-Saharan Africa
  2. BSouth East Asia
  3. CEastern Europe
  4. DNorth America

Question 19

the heart
Where is the mammalian heart beat initiated?
  1. Aatrioventricular node
  2. Bleft atrium
  3. Csinoatrial node
  4. DPurkyne tissue

Question 20

disease
Which one is not a factor for tuberculosis in developing countries?
  1. Alongevity
  2. Bmalnutrition
  3. Cimmunosuppression
  4. Dovercrowding

Question 21

disease
Ebola is prevalent in
  1. AWest Africa.
  2. BEastern Europe.
  3. CSouth East Asia.
  4. DSub-Saharan Africa

Question 22

genetic engineering
Which enzyme is not used in the production of insulin by genetic engineering?
  1. Arestriction endonuclease
  2. Breverse transcriptase
  3. CRNA polymerase
  4. DDNA ligase

Question 23

genetic engineering
Analysis of a person's DNA to check for the presence of a particular allele is called
  1. Agene technology.
  2. Bgene therapy.
  3. Cgenetic screening.
  4. Dgenetic engineering.

Question 24

genetic engineering
Which one is not an advantage of gene technology?
  1. AOffspring production can be controlled.
  2. BDevelopment can be copyrighted.
  3. CSexual reproduction is not necessary.
  4. DGenes for desirable characteristics can be cloned.

Question 25

the heart
The 'dub' sound in the cardiac cycle is produced during
  1. Aarterial systole.
  2. Barterial diastole.
  3. Cventricular systole.
  4. Dventricular diastole.

Question 26

nervous coordination

The graph shows changes in the axon during propagation of a nerve impulse.

Which ion is largely responsible for the region x?

  1. ANa⁺
  2. BK⁺
  3. CCl⁻
  4. DCa²⁺

Question 27

reproduction
After ovulation
  1. Athe polar body starts to release progesterone.
  2. Bthe Graafian follicle develops another ovum.
  3. Coogenesis is completed if fertilisation occurs.
  4. Dthe ovum will divide into a ball of cells.

Question 28

reproduction
The number of spermatids produced from a single spermatogonium is
  1. Aone.
  2. Btwo.
  3. Cfour.
  4. Deight.

Question 29

reproduction

The list shows hormones produced during the menstrual cycle:

1 Folide Stimulating Hormone (FSH)
2 Progesterone
3 Luteinizing hormone (LH)
4 Oestrogen

What is the correct order of release of the hormones?

  1. A2 1 3 4
  2. B1 4 3 2
  3. C4 3 2 1
  4. D3 4 1 2

Question 30

reproduction
What is the role of hyaluronidase enzyme during acrosome reaction?
  1. ARemove the zona pellucida.
  2. BStored for future use.
  3. CDigest a path through the granulosa cells.
  4. DAids in the movement of sperm.

Question 31

plant reproduction

The diagram shows part of the carpel from a mature flower.

Which part, A, B, C or D, will form the zygote after fertilization?

  1. AA
  2. BB
  3. CC
  4. DD

Question 32

homeostasis
What is the role of parathormone?
  1. Aincrease blood Ca²⁺ levels
  2. Bdecrease blood Ca²⁺ levels
  3. Cfor hormone replacement therapy
  4. Dreduces effects of premenstrual tension

Question 33

ecology
Which ecological unit has the greatest competition?
  1. Aecosystem
  2. Bcommunity
  3. Chabitat
  4. Dniche

Question 34

ecology
Nitrogen fixing bacteria contributes to the nitrogen cycle by
  1. Areturning nitrogen to the atmosphere.
  2. Bchanging nitrogen to ammonium.
  3. Cconverting ammonia to nitrate.
  4. Dreturning nitrogen to autotrophs.

Question 35

ecology
Which one is not a general characteristic of eutrophication?
  1. APresence of algae.
  2. BPresence of blue-green bacteria.
  3. CHigh biological oxygen demand.
  4. DHigh species diversity.

Question 36

ecology
Which sequence shows the descending order of levels of organisation?
  1. Apopulation → community → ecosystem → biosphere
  2. Bbiosphere → ecosystem → community → population
  3. Ccommunity → population → biosphere → ecosystem
  4. Decosystem → biosphere → community → population

Question 37

classification
Which is not a socio-economic importance of the kingdom animalia?
  1. Atourism
  2. Bfood
  3. Cfermentation
  4. Dhunting

Question 38

classification
Which is a diagnostic feature of the phylum Echinodermata?
  1. Atriploblastic
  2. Bno head
  3. Ctube feet
  4. Dcalcareous exoskeleton

Question 39

classification
Which one is the correct taxonomic hierarchy?
  1. Akingdom, phylum, class, order, family, genus, species.
  2. Bkingdom, class, phylum, order, family, genus, species.
  3. Ckingdom, phylum, order, family, class, genus, species.
  4. Dkingdom, phylum, class, family, order, genus, species.

Question 40

classification
Which is not an importance of prokaryotes?
  1. ABio-technology
  2. BDecomposition
  3. CFermentation
  4. DPenicillin production

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