Download Quiz 23

South Tuen Mun Government Secondary School
MOCK EXERCISE
BIOLOGY PAPER 1
Secondary 6
Maximum mark : 120
Time allowed : 2 hours 30 minutes
GENERAL INSTRUCTIONS
1. There are TWO sections, A and B, in this Paper. You are advised to finish Section A in about 35 minutes.
2. Section A consists of multiple-choice questions in this question paper. Section B contains conventional
questions printed separately in Question-Answer Book B.
3. Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section B
should be written in the spaces provided in Question-Answer Book B. The Answer Sheet for Section A
and the Question-Answer Book for Section B will be collected separately at the end of the
examination.
_________________________________________________________________________________________
INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)
1.
Read carefully the instructions on the Answer Sheet. After the announcement of the start of the
examination, you should write your name, class and class number, and, insert the information required in
the space provided. No extra time will be given for these after the ‘Time is up’ announcement.
2.
When told to open this book, you should check that all the questions are there. Look for the words ‘END
OF SECTION A’ after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS. You are advised to use an HB pencil to mark all the answers on the
Answer Sheet, so that wrong marks can be completely erased with a clean rubber. You must mark the
answers clearly; otherwise you will lose marks if the answers cannot be captured.
5.
You should mark only ONE answer for each question. If you mark more than one answer, you will receive
NO MARKS for that question.
6.
No marks will be deducted for wrong answers.
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There are 36 questions in this section.
The diagrams in this section are NOT necessarily drawn to scale.
1. Which of the following comparisons between glucose and fat is / are correct?
(1) Glucose is soluble in water while fat is insoluble in water.
(2) Glucose is stored in liver while fat is stored in the adipose tissue.
(3) The same mass of glucose gives less energy than the same mass of fat.
A. (3) only
B. (1) and (2) only
C. (1) and (3) only
D. (1), (2) and (3)
2. The table below shows the results of an experiment on the rate of uptake of sugars by rat intestine.
Sugars
Rate of absorption relative to glucose
Under aerobic conditions
Under anaerobic conditions
Hexose sugar : glucose
100
30
galactose
Pentose sugar : xylose
arabinose
106
32
30
32
32
30
What conclusion may be drawn from the results?
A. All four sugars are absorbed by active transport.
B. Only hexose sugars can be metabolized by the rat.
C. The intestine is freely permeable to hexose sugar.
D. The rate of passive diffusion of all four sugars into the gut is similar.
3. In the graph below, curve X represents the course of an enzyme-catalysed reaction under optimum
conditions. Curve Y shows the action of the same enzyme on the same substrate but one condition is
different from those of curve Y.
Which factor has been changed to give the results shown by curve Y?
A. The substrate concentration is higher.
B. An inhibitor is present.
C. The concentration of enzyme is lower.
D. The temperature of the reaction mixture is lower.
4. Mitochondria and chloroplasts are different in:
A. enzyme is found in chloroplasts only.
B. electron transport chain reactions are carried out in mitochondria only.
C. ATP is made by mitochondria only.
D. NADP is found in chloroplasts only.
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Directions : Questions 5 and 6 refer to the diagram below which summarizes the pathway of glucose
metabolism.
5. Which steps result in a net production of ATP?
A. 1 and 4
B. 2 and 5
C. 2 and 4
6. Which steps do not occur in the mitochondrion of a mesophyll cell?
A. 1 and 2 only
B. 1, 2 and 3 only
C. 4 and 5 only
D. 3 and 5
D. 1, 2, 3, 4, 5
7. If light intensity is uniformly high, under which conditions is carbon dioxide most likely to be the main
limiting factor on the rate of photosynthesis?
Temperature (℃)
% carbon dioxide
A.
B.
C.
25
20
10
4.00
0.04
0.04
D.
5
0.01
8. Homologous chromosomes are
A. chromosomes that have the same sequence of nitrogen bases.
B. chromosomes that will separate into two different nuclei during mitotic cell division.
C. chromosomes that move to the same pole during meiotic cell division.
D. chromosomes that have the same alleles or different alleles of a gene at the same locus.
9. In a species of plant, the allele for tall stems is dominant over that for short stems and the allele for purple
flowers is dominant over that for white flowers. A cross between two plants produced the following
phenotypic ratio:
Tall, purple-flowered
Tall, white-flowered
Short, purple-flowered
Short, white-flowered
3
3
1
1
What are the phenotypes of the parents?
A. short, purple-flowered and tall, purple-flowered
C. tall, purple-flowered and tall, white-flowered
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B. short, white-flowered and tall, purple-flowered
D. tall, white-flowered and short, white-flowered
10. The diagram below shows the inheritance of a form of breast cancer associated with the presence of just one
allele of the autosomal gene BRCA 1.
What is the probability that woman X inherits the BRCA 1 allele associated with breast cancer?
A. 0.00
B. 0.25
C. 0.50
D. 1.00
11. One complete turn of the double helix of DNA contains 10 pairs of bases and is 3.4 nm long. What is the
approximate length of the DNA coding sequence of lysozyme, a protein of 129 amino acids?
A. 44 nm
B. 132 nm
C. 379 nm
D. 439 nm
12. When organochlorine insecticides such as DDT were widely used to kill mosquitoes in all places in the
world, it was found that mosquitoes in malarial regions [note : malarial regions = places where a disease
malaria is very common and malaria is transmitted through mosquitoes] developed resistance more rapidly
than did mosquitoes in non malarial regions. What could account for the difference in the rates of the
development of resistance?
A. Mosquitoes in non malarial regions have a higher chance to reproduce.
B. More insecticides are used in malarial regions to kill mosquitoes.
C. Mosquitoes in non malarial regions need not develop the insecticide resistant allele against the
insecticide.
D. More random mutations are found in the mosquitoes in malarial regions.
13. The diagram below shows the pathway by which water is transported from roots to leaves. Measurements of
the water potential of the cells at points P, Q and R were taken.
Which values for water potential (in MPa) are consistent with the cohesion-tension hypothesis of water
transport?
A.
P
-1
Q
0
R
-2
B.
C.
D.
-2
-4
0
0
-2
-2
+2
0
-4
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14. A mutation adds an extra nucleotide pair near the beginning of a gene coding for a particular protein. What
would be the effect of this on the structure of the protein synthesized?
A. Most of the amino acids in the polypeptide are changed.
B. Two amino acids in the polypeptide are changed.
C. One amino acid in the polypeptide is changed.
D. No amino acid in the polypeptide is changed.
15. A medical scientist investigated four species of insects. He found that one of the four species fed on human
blood and that the others fed on plant tissues. He tested the digestive enzymes present in the gut of the four
species. The results are shown below:
Which insect species fed on human blood?
Enzyme present in insect gut
Insect species
amylase
lipase
protease
sucrase
A.
X


X
B.

X
X

C.
X

X

D.


X
X
Directions : Questions 16 and 17 refer to the diagram below which shows some of the structures in the human
thoracic cavity:
16. Heavy cigarette smoking will affect the functioning of
A. structure 1, 2 and 3.
C. structure 1, 3 and 4.
B. structure 1, 2 and 4.
D. structure 2, 3 and 4.
17. Which of the following will occur if structure 5 is broken?
A. The lung will collapse.
B. The ribs will stop moving.
C. The air sacs will be filled with body fluid.
D. The breathing rate decreases.
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Directions : Questions 18 and 19 refer to the diagram below which represents the relationship between tissue
cells and capillaries in the transport of carbon dioxide.
18. At which point does carbonic anhydrase work?
A. P
B. Q
C. S
D. T
19. Which of the following statements are correct?
(1) Process R is a passive process that depends on concentration gradient.
(2) The shape of red blood cell increases the surface area for process R.
(3) If the tissue cells are cells of liver, carbon dioxide is produced by deamination.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Directions : Questions 20 and 21 refer to the diagram below which shows part of a lotus plant:
20. Both structure 1 and 3 can give rise to new plants. Which of the following comparisons between the two
ways of reproduction is incorrect?
A.
B.
C.
D.
Reproduction by structure 1
Results in genetic variation
Reproduction by structure 3
No genetic variation
Relies on external agent
Does not need external agent
Both can prevent overcrowding of offspring
Both can enable the plant to survive adverse conditions
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21. Which structures store food for the development of new plants?
A. 1 and 4
B. 1 and 5
C. 2 and 4
D. 2 and 5
Directions : Questions 22 and 23 refer to the information below:
In a set-up, some living yeast cells were added to a 10% glucose solution under anaerobic
conditions. The graph below shows the changes in the amount of three substances in the set-up:
22. Which curves represent yeast and glucose respectively?
A.
B.
C.
D.
Yeast
1
1
2
3
Glucose
2
3
3
1
23. What products are formed in the set-up?
A. ethanol and lactic acid
C. lactic acid and carbon dioxide
B. ethanol and carbon dioxide
D. ethanol, lactic acid and carbon dioxide
24. In a set-up, the tip of a coleoptile was removed and the coleoptile was treated as shown in the diagram
below:
Which of the following set-ups will give a similar result as the one above?
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Directions : Questions 25 and 26 refer to the flow chart below which shows the steps leading to the responses of
a person when strong light enters his eye:
25. What are structures P and Q?
A.
B.
C.
D.
P
Choroid
Retina
Choroid
Retina
Q
Ciliary body
Iris
Iris
Ciliary body
26. What are the differences between the two responses?
Raising one hand to screen off strong light
Constriction of pupil
(1)
cannot protect the light sensitive cells
protect light sensitive cells from strong light
(2)
slower
faster
(3)
learned
learning is not required
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
27. The diagram below shows a model of a movable joint:
Which of the following combinations is correct?
A.
B.
C.
D.
Type of joint represented by the model
Hinge joint
Hinge joint
Ball and socket joint
Ball and socket joint
Example
Knee joint
Shoulder joint
Shoulder joint
Knee joint
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D. (1), (2) and (3)
28. Curare is a chemical that causes asphyxiation where the skeletal muscle becomes paralyzed (cannot
contract). In an experiment to find out the action of curare, curare is added to a neuromuscular junction at
either point X, Y or Z as shown below:
It is found that
(a) when curare is added at X, a nerve impulse cannot stimulate the skeletal muscle to contract.
(b) when curare is added at Y and Z, a nerve impulse can stimulate the skeletal muscle to contract.
Which of the following correctly explains the effect of curare?
A. Curare inhibits the transmission of nerve impulse across the neuromuscular junction.
B. Curare prevents the skeletal muscle from stimulation of nerve impulse.
C. Curare inhibits the release of neurotransmitter.
D. Curare prevents the formation of skeletal muscle cells.
29. The diagram below shows some biochemical pathways in a liver cell. Some of the steps, where hormones
can affect, are labeled 1 to 5.
At which numbered steps would the hormone insulin increase the rate of the pathways in the direction
indicated?
A. 1, 2 and 3
B. 1, 2 and 5
C. 2, 3 and 4
D. 1, 2, 3, 4, 5
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30. Nitrates from agricultural land can enter rivers, resulting in rapid growth of aquatic algae. Which of the
following control methods should be used by conservationists in order to have the least damaging effects on
the environment?
A. The aquatic algae are harvested, dried and used as organic fertilizer of the agricultural land or as food
to feed cattle.
B. Denitrifying bacteria are added into the river to convert nitrate to nitrogen gas.
C. Other species of algae are added into the river to compete for the nitrates.
D. The aquatic algae should be allowed to grow, die and decay naturally.
Directions : Questions 31 and 32 refer to the diagram below which shows a simplified nitrogen cycle:
31. What are P and Q?
A.
B.
C.
D.
P
Animal proteins
Urea
Animal proteins
Nitrate
Q
Nitrate
Nitrate
Urea
Urea
32. Which of the processes require the action of bacteria?
A. W, X, Y and Z
B. W, X and Y only
C. X, Y and Z only
D. X and Y only
33. The skin can protect our body from infection because
(1) the outer layer of dead cell forms a protective layer to prevent the entry of foreign materials,
(2) the hair forms a net to trap bacteria,
(3) the oily gland produces oil that can kill germs.
A. (1) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
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34. A person was infected by a virus. 40 days later, he was infected again by the same virus. Blood samples
were taken from the person at regular intervals and the concentration of the virus was determined. The
results are shown in the graph below:
Which of the following graphs best represents the change in concentration of the specific antibody in the
blood?
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Directions : Questions 35 and 36 refer to the following information:
Cholesterol plaque is formed by the accumulation of cholesterol on the wall of arteries. The
diagrams below show a type of operation which is used to treat the blockage of arteries by
cholesterol plaque.
35. Which of the following statements is incorrect?
A.
B.
C.
D.
The inflated balloon helps to widen the lumen of the artery.
The larger the plaque in the artery, the lower the blood pressure.
The operation may restore normal blood flow through the artery.
Formation of the plaque in the artery is partly due to a low fibre, high fat diet.
36. If the arteries of the heart wall are blocked by cholesterol plaque, a heart attack may occur because
A. the rate of heart beat increases.
B. less blood is pumped out from the heart.
C. the heart muscle becomes fatigued easily.
D. less oxygen and nutrients are transported to the heart muscle.
END OF SECTION A
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