WESTWOOD HIGH SCHOOL MOCK EXAMINATIONGRADE XIIMARCH
2015BIOLOGYPaper 01 80 minutesREAD THE FOLLOWING INSTRUCTIONS
CAREFULLY1. This test contains 45 items. You have 80 minutes to
answer ALL questions. Each item is worth ONE point2. Each item has
four suggested answers lettered (A) (B) (C) (D), CIRCLE the letter
which corresponds to the answer of your choice3. Work quickly and
carefully as you can. If you cannot answer an item, move on to the
next item, and then return to the more difficult item later. 4. If
you decide to change your answer, be sure to clearly omit the
previous answer before choosing your new answer.5. You may do any
rough work in this booklet. 6. The use of non-programmable
calculator is allowed.
1. Which of the following bonds between the molecules enables
water to exist as a liquid rather than a gas at room temperature?A.
CovalentB. HydrogenC. IonicD. Hydrophilic
2. Item 2 refers to the structures below two isomers of
glucose.Which of the following statements is true for BOTH
isomers?
A. Both contribute to the structure of starchB. Both contribute
to the structure of celluloseC. I contributes to the structure of
cellulose, II contributes to the structure of starch D. I
contributes to the structure of starch, II contributes to the
structure of cellulose3. Phospholipids will affect the function of
which of the following cell structures?I. Endoplasmic reticulum II.
CentriolesIII. MitochondrionIV. Nucleolus
A. I and IIB. I and IIIC. II and IVD. III and IV
Item 4 refers to the following chemical structure of a
molecule
4. Which of the following is the molecule represented by the
structure?A. TriglycerideB. TripeptideC. TriphosphateD.
Trisaccharide5. In rheumatoid arthritis, cartilage of the joints is
thought to be digested by the hydrolytic enzymes found in the A.
NucleolusB. RibosomesC. LysosomesD. Golgi bodies6. Carbohydrates
are mainly transported in the plants in the form of A. FructoseB.
GlucoseC. SucroseD. Starch7. Collagen consists of three polypeptide
chains held together by H-bonds, N-H groups and CO groups. Which of
the following terms describe the structure of collagen?A. A triple
helixB. An - helixC. A double helixD. A -helix
Item 8 refers to the diagram below which shows the ring
structure of glucose
8. Which of the following indicates the form of glucose and the
molecules in which it is presentForms of glucoseA.B.C.D.
Where Present
Cellulose
Cellulose
Starch
starch
9. Triglycerides are excellent source of energy for the body
because of theirI. Large sizeII. Ability to insulate III. Large
number of C-C bondsIV. Insolubility in water
A. I and III onlyB. I and IV onlyC. II and III onlyD. II and IV
only
Item 10 refers to the tests performed by students to identify
food substances present in a solution. The tests were carried out
and their respective results are shown in the table below
10. Which of the following indicates the food substances present
in the students solution?A. Starch, proteinB. Non-reducing sugar
onlyC. Reducing sugar and non-reducing sugarD. Non-reducing sugar,
protein11. In microscopy, the term resolution describes the A.
Magnification by eyepiece lensB. Magnification by objective lensC.
The degree to which the specimen is magnifiedD. The ability of the
microscope to clearly distinguish between two points on the
specimen12. The molecule that is produced during the formation of a
peptide bond is A. OxygenB. WaterC. Carbon dioxideD. Nitrogen 13.
When viewed under an electron microscope, the cells in a specimen
were found to have closely packed mitochondria with cristae closely
packed together. It is likely that the MAIN function is A.
SecretionB. PhotosynthesisC. MovementD. Protein synthesis
14. Which of the following bonds hold two strands of DNA
molecule togetherA. PeptideB. HydrogenC. WaterD. Glyosidic
Item 15 refers to the diagram showing a plasma membrane
15. The figure BEST demonstratesA. DiffusionB. ExocytosisC.
Active transportD. Facillated diffusionItem 16 refers to a diagram
below which shows the activation energy for an enzyme catalysed
reaction and an uncatalysed reaction
16. The activation energy for an enzyme-catalysed reaction is
represented by the region labelled:A. IB. IIC. IIID. IV17. Which of
thye following diagrams best illustrates the effect of temperature
on the rate of an enzyme-catalysed reaction
Item 18 refers to the diagram below showing a segment of a
strand of DNA
18. The base X isA. CytosineB. GuanineC. UracilD. AdenineItem 19
refers to a diagram below showing the general structure of a plant
cell
19. Which of the options correctly indicates the organelles that
contain DNAA. 1,2,3B. 2,3,5C. 2,4,6D. 3,5,620. The organelles
involved in the manufacture, modification and transport of lipases
respectively areA. Ribosomes, rough ER, Golgi body, lysosomesB.
Nucleus, cytoplasm, rough ER, Golgi bodyC. Ribosomes, smooth ER,
Golgi body, lysosomesD. Lysosomes, ribosomes, smooth ER, Golgi
body
Item 21 refers to the figure below which shows the structure of
a bacterial cell as seen under an electron microscope.
21. The structure involved in genetic engineering isA. IB. IIC.
IIID. IV22. When a plant cell is placed with a less negative water
potential than its cell sap, the cell becomes moreA. Flaccid
because solution diffuses out of cellB. Flaccid because water
diffuses out of cellC. Turgid because the solution diffuses into
the cellD. Turgid because the water diffuses into the cell
Item 23. The sequences of bases in one strand of DNA from part
of a gene is ACC CCA TTT CAT CCAThe table below shows some
anticodons of some tRNA molecules and the specific amino acid each
would carryAmino AcidtRNA
AlanineCGA
GlycineCCA
LysineUUU
ProlineGGA
TryptophanACC
ValineCAU
23. Which of the following amino acid sequence is coded for this
part of the gene?A. Valine-glycine-tryptophan-glycine-lysineB.
Tryptophan-glycine-lysine-valine-glycineC.
Lysine-valine-lysine-valine-glycineD.
Lysine-tryptophan-glycine-glycine-alanine24. Mendel crossed
pure-breeding round-yellow peas with wrinkled-green green peas. The
F1 seeds were self-pollinated and the seeds of the F2 showed the
following characteristics:315 round and yellow101 wrinkled and
yellow108 round and green32 wrinkled and greenThe appearance of the
new combinations of characteristics, round and green, and wrinkled
and yellow is due to A. Dominant epistasisB. Independent assortment
of alleles for colour and shapeC. Genes for colour and shape being
on the same chromosomeD. Multiple alleles25. Which of the following
BEST describes the null hypothesis?A. A hypothesis which states
that there is no difference between the observed and the expected
dataB. A hypothesis which states that there is a significant
difference between items under investigationC. A hypothesis which
has zero testabilityD. A hypothesis which can only be tested by
observations.26. The following are events in transcription.I. RNA
nucleotides are bound togetherII. Hydrogen bonds between bases are
brokenIII. The mRNA formed leaves the nucleusIV. Activated RNA
nucleotides pair up with exposed bases of DNAV. Part of a DNA
molecule unwindsThe correct sequence of events isA. V, I, III, II,
IVB. V, II,III,I, IVC. V, II, I, IV, IIID. V, II, IV, I, III
27. In addition to human insulin gene, which of the following
would be required to provide a recombinant plasmidA. Reverse
transcriptaseB. DNA ligaseC. ADPD. RNA polymerase28. One
implication of the use of genetically modified organisms on humans
isA. Too many humans might be producedB. Organisms designed for use
in humans might escape and cause harmful consequencesC. Too few
humans might be producedD. Organism designed for use in humans
might be produced in large numbers
29. The phenotype of an organism is BEST explained as those
visible characteristics thatA. Provide a description of the overall
appearance of an organismB. Are due to the impact of the
environment in which the organism livesC. Reflects the genetic
make-up of the organismD. Reflects the interaction of the genetic
make-up and the environment on the organism.30. Both Pinus radiata
and Pinus attenuata occupy the same habitat. However, Pinus
attenuata flowers in February while Pinus attenuata flowers in
April. What type of isolating mechanism does this exemplify?A.
SeasonalB. EcologicalC. MechanicalD. Behavioural31. Some type of
genetic mutations can result in frameshift. Which of the types of
mutations listed below are MOST likely to result in a frameshift?A.
SubstitutionB. EcologicalC. InsertionD. Duplication
A. II and III onlyB. III and IV onlyC. I,II, and III onlyD. II,
III, IV only
32. Which of the following methods of asexual reproduction is
INCORRECT, either by definition or its example?Type of
reproductionDefinitionExamples
A. Binary FissionSplitting in two daughter cells of similar
sizeAmoebabacteria
B. FragmentationSplitting into several pieces, each of which
regrowsFlatwormsSpirogyra
C. BuddingProducing an outgrowth from the parent, which breaks
off to become separate individualHydraYeast fungus
D. Spore formationProduces small lightweight spores, to assist
in air dispersalHibiscusFlamboyant
33. Which of the following structures is NOT involved in asexual
reproduction?A. StamenB. BulbC. TuberD. Rhizome34. In some plants
the androecium matures before the gynoecium. Such plants are
described asA. DioeciousB. MonoeciousC. ProtandrousD.
Protogynous
35. When the pollen grain alights on the stigma and starts to
grow, the first action is thatA. Double fertilisation occursB. The
zygote divides to form a row of cellsC. A male nucleus fuses with
the endosperm nucleusD. The generative cell divides into two male
gametesItem 35 refers to the diagram below which shows cross
section of an anther
Which of the numbered structure produces the gametes?A. IB. IIC.
IIID. IV
36. The following are advantages of two types of pollinationA.
No need for another parent plantB. Increases vigourC. Widens gene
poolD. Does lose advantageous traitsWhich of the following are
specific to cross pollinationA. I and IV onlyB. I and II onlyC. II
and III onlyD. I, II, III, and IV
37. Which of the following represents the possible sequence for
tissue culture?A. Meristemsstimulate rooting shoot growth plantlet
young plantB. Young plantmeristemsshoot growthstimulate
rootingplantletC. Plantletstimulate rootingyoung plantmeristems
shoot growthD. Young plantshoot growthmeristems stimulate rooting
plantletItem 38 and 39 refer to the diagram below which shows the
longitudinal section through an ovule of an angiosperm
38. After fertilisation, the region labelled X will develop into
theA. PericarpB. Seed coatC. Fleshy part of fruitD. Flesh part of
seed39. The role of Y is to A. Fuse with male nucleus to form
endospermB. Fuse with male nucleus to form the cotyledonC. Fuse
with male nucleus to form the embryoD. Support the position of the
ovum and disintegrate after fertilisation.Item 40 refer to the
following diagram below which illustrates a section of the human
female reproductive system.
40. Which of the following correctly identifies the parts
labelled P,Q,R,S?
Item 41 refers to the diagram below which shows a simplified
version of the structure of a mammalian testis
41. Spermatozoa are stored in the region labelledA. IB. IIC.
IIID. IVItem 42 refers to the diagram below which shows the stages
of spermatogenesis that visible in the transverse section of a
seminiferous tubule.
42. Follicle stimulating hormone acts directly on the cells
labelled A. IB. IIC. IIID. IV
43. Which of the following hormones is directly responsible for
the release of the ova from the ovary?A. OestrogenB. ProgesteroneC.
Luteinising hormoneD. Follicle stimulating hormone44. The role of
high dose progesterone only pills is to A. Directly cause lysis of
spermB. Promote a build-up of the endometriumC. Promote thinning of
the cervical mucusD. Completely inhibit follicular development and
ovulation.Item 45 refers to the graphs below summarising the
hormonal changes during the menstrual cycle of a woman45. When will
ovulation occur if there is a surge of LH and FSH on day 12 of the
cycle?A. Within 24 hours of the surgeB. 36 hours after the surgeC.
38 hours after the surgeD. Before day 12, LH and FSH have no impact
on ovulation