1. The graph below represents a characteristic of life. Which one is it?
A. adaptation
B. growth
C. homeostasis
D. evolution
E. reproduction
Questions 2-3: Refer to the given below
The graph below shows the effect of exercise intensity on sugar and fat consumption and lactic
acid production.
2. What conclusion can be made from the graph regarding carbohydrate and fat consumption
compared to increasing exercise intensity?
A. only carbohydrates are consumed in anaerobic respiration ‫عشان بتطلع الكتي اسيد‬
B. the rate of anaerobic respiration decreases with the increasing intensity of exercises in
both organic compounds
C. aerobic respiration is more dominant in triglycerides compared to carbohydrates
D. lactic acid production increases as the cell receives more oxygen due to exercising
E. carbohydrates and fats are consumed at the same rate to ensure maximum production
of lactic acid
3. Which of the following molecules is most probably involved in the reaction occurring in
the graph?
A.
B.
C.
D.
E.
fatty acid
oxygen
amino acid
glycerol
glucose
Questions 4-5 : Refer to the given below
The flu virus is known to affect the process of cellular respiration and ATP production. The table
below shows the amount of ATP produced in control cells and in cells infected by the flu virus.
Time (hours)
1
2
3
4
5
6
7
8
ATP production (μmol\106 cells)
control cells
virus infected cells
0.1
0.1
0.2
0.15
0.3
0.2
0.4
0.3
0.5
0.4
0.6
0.45
0.7
0.5
0.8
0.6
4. Which of the following graphs most probably represents the data regarding infected cells
shown in the table above?
A.
B.
C.
D.
E.
1
2
3
4
5
5. What is the final percent change in the ATP production in virus infected cells compared to
control cells?
A.
B.
C.
D.
E.
75% decrease
25% decrease
75% increase
25% increase
cannot be determined from the table
6. All of these can be true about the effect of the virus on cellular respiration EXCEPT:
A. most of the body functions that require energy will have compromised
‫تضعف‬performance
B. the virus can cause fatigue ‫ارهاق‬in the body
C. the virus can enhance ‫ يحسن‬the function of ATP synthase during cellular
respiration
D. the reaction that is most likely to be the most affected by the virus is the Krebs cycle
E. the decrease in ATP production can compromise the body’s immune response against
the virus
7. The plasma membrane has a hydrophilic head and a hydrophobic tail. Which of the
following can be maintained due to this unique structure of the plasma membrane?
A. large water-soluble substances will find it difficult to penetrate the plasma
membraneto the inside of the cell
B. water-insoluble substances can easily pass through the polar head but will be stuck in
the middle of the bilayer
C. the cell maintains its structure because of the way a phospholipid bilayer is formed
D. polar molecules find it easy to penetrate the plasma membrane
E. the plasma membrane maintains a very stiff structure due to the fluid mosaic model of
the plasma membrane.
8. A cell undergoing mitosis was shown to have 16 chromosomes at metaphase. How many
chromosomes will each of the daughter cells have at the end of mitosis?
MITOSIS DOESNOT CHANGE THE NUMBER OF CHROMOSOMES
THE NUMBER OF CHROMOSOMES IS CHANGED MIOSIS
A.
B.
C.
D.
E.
4
8
16
32
it depends on the species
9. What type of reproduction is shown in the figure below?
A.
B.
C.
D.
E.
Budding ‫تبرعم‬
Fragmentation ‫تقطيع وكل حته بتكبر لوحدها‬
sexual reproduction
binary fission ‫الكائن بيتقسم نصين‬
parthenogenesis
10. Which of the following organic compounds is capable of performing the following
functions: transport substances, make hormones and speed up reactions?
A.
B.
C.
D.
E.
carbohydrates
proteins  BECAUSE IT MAKES ENZYMES AND HORMONES
lipids
nucleic acids
A and B
11. Which of the following organelles/structures would you expect to find abundantly in a
sperm?
A.
B.
C.
D.
E.
nucleus
acrosome
flagella
mitochondria  BECAUSE IT GIVES ENERGY
ribosomes
12. Freshwater fish have to make many adaptations in order to survive in an environment with
less concentration of salt in their surroundings. All of the following are characteristics of
freshwater fish EXCEPT:
A.
B.
C.
D.
E.
they need to have an internal salt concentration higher than that of freshwater
they can eat more to replenish‫ تعوض‬the lost salt from their bodies
they need to urinate large amounts with little salt
They do not need to drink at all
Their kidneys should be able to expel ‫ تطرد‬maximum amount of salt to the outside
13. Photosynthesis and cellular respiration are known to be complementary ‫ مكملين‬to one
another. Allof the following are true about photosynthesis and cellular respiration
EXCEPT:
A. the products of one process are the reactants of the other process
B. glucose produced during photosynthesis turns back into carbon dioxide by cellular
respiration to be used again in photosynthesis
C. these two processes are the main contributors and influencers of the carbon cycle
D. the oxygen released in photosynthesis can be used in the electron transport chain of the
cellular respiration
E. water acts as a reactant in cellular respiration (glucose-oxygen) and a product in
photosynthesis
Questions 14-15: Refer to the figure below
14. Which stage of meiosis is represented in figure A?
A.
B.
C.
D.
E.
metaphase I
metaphase II
anaphase I
anaphase II
telophase I
15. Which of the following CANNOT be a gamete produced by the cell in figure A?
A. 1
B. 2
C. 3
D. 4
E. 5
Questions 16-17: Refer to the given below
A scientist conducted a series of experiments on a specimen to identify whether it is a living or
non-living organism. The results of the experiments are found in the table below:
is capable of reproduction when put in a host
is incapable of growth after some time
possesses DNA
is capable of adapting to changing environments
is incapable of utilizing energy
16. Based on the results, what conclusion can the scientist make?
A. the fact that it can adapt to changing environments makes this specimen a living
organism regardless of other characteristics
B. any specimen possessing any form of nucleic acid such as DNA will be considered a
living organism
C. it is a non-living structure since it is incapable of growing and developing
D. it is living since being able to reproduce on its own is not necessary to conclude that a
specimen is not living
E. the table does not show enough evidence to make any assumptions on the viability of
the specimen
17. Which of the following is most likely to be the specimen in the experiment?
A.
B.
C.
D.
E.
virus
bacteria
protozoan
amoeba
zooplankton
18. All of the following are examples of homeostasis(reaction-balance) in the human body
EXCEPT:
A.
B.
C.
D.
insulin is released after eating a sugary snack to maintain a constant blood glucose level
carbon dioxide is exhaled from lungs to ensure a stable pH of blood
on hot days, sweating makes sure body temperature remains at 37°C
being able to run and throw objects with high precision ensures we can protect
ourselves from predators
E. urinating will remove unnecessary excess water from the body
Questions 19-21: Each set of lettered choices below refers to the numbered questions of
statements immediately following it. Select the one lettered choice that best answers each
question and fill in the corresponding space on the answer sheet. A choice may be used once,
more than once, or not at all in each set.
A.
B.
C.
D.
E.
nucleic acid
ribosomes
cell wall
plasma membrane
mitochondria
19. this can only be found in eukaryotic cells E
20. this is absent from animal cells C
21. can bind to tRNA
B
22. In mitosis, chromosomes condense and become visible during:
A.
B.
C.
D.
E.
telophase
anaphase
metaphase
prophase
interphase
Questions 23-24: Refer to the given below
The following graph shows the intracellular DNA mass over a period of time.
23. Based on the graph, which of the following cells is most probably represented?
A.
B.
C.
D.
E.
skin cell
liver cell
sperm cell
spermatogonium cell
red blood cell
24. Which of the following phases is represented by letter F?
A.
B.
C.
D.
E.
G1 phase
S phase
metaphase I
telophase I
metaphase II
25. A scientist performed an experiment to determine the effect of temperature on the length
of the cell cycle in one of the species. The duration of the cell cycle at room temperature is
15 hours. He cultured identical stem cells in four culture media with the same content of
nutrient and oxygen gas but at different temperatures. The duration of the cell cycles at
different temperatures are recorded in the following table.
Temperature (oC)
10
15
20
25
Length of the cell cycle (hours)
54.6
29.8
18.8
13.3
The data in the table shows that
A.
B.
C.
D.
E.
cells divide faster as the temperature decreases.
the length of the cell cycle is not affected by temperature.
the length of the cell cycle is inherited and not affected by temperature.
cells divide faster as the temperature increases.
B and C
26. ATP is produced during which of the following processes?
I. Photosynthesis
II. Aerobic respiration
III. Fermentation
A.
B.
C.
D.
E.
I only
II only
I and III only
II and III only
I, II, and III
27. The cells of the yellow dung fly contain 5 pairs of autosomal chromosomes and one pair
of sex chromosomes. Upon completion of Meiosis II, how many chromosomes will each
yellow dung fly gamete contain?
6 pairs  12 chromosome
3 pair  6 chromosomes
A.
B.
C.
D.
E.
5
6
10
12
24
28. The point at which the cytoplasm divides is
A.
B.
C.
D.
E.
mitosis.
prophase.
cytokinesis.  cellular division – division of the cytoplasm
interphase.
metaphase.
29. Which of the following is NOT a function performed by a membrane protein?
A.
B.
C.
D.
E.
hormone-binding
cell adhesion ‫لزق‬
enzyme synthesis ( organs )
pumps of active transport
receptors
Questions 3031
DNA, Chromosome, and Cell Cycle
In a Petri dish, we dispose a culture of plant cells. Under specific treatment, all cells undergo the
beginning of G1 phase at t0 (synchronized cell cycle at the beginning of the experiment). Let X be
the DNA mass of the culture at t0.
Given:
For the studied cells:
-
Cell cycle lasts 12 hours.
G1 lasts 7 hours.
S lasts 3 hours.
G2 lasts 1 hour.
30. The DNA mass of the culture after 36 hours will be:
A.
B.
C.
D.
E.
X
2X
4X
8X
16X
31. The cultured cells are diploid cells and contain 4 chromosomes each. The number of
chromosomes found in each cell after t0 + 35 hours is
A.
B.
C.
D.
E.
4 chromosomes with one chromatid each.
4 chromosomes with two chromatids each.
8 chromosomes with one chromatid each. X
8 chromosomes with two chromatids each. X
The data is insufficient.x
32. During karyotype preparation, the dividing cells are blocked at
A.
B.
C.
D.
E.
prophase.
anaphase.
interphase.
telophase.
metaphase.
Directions: Each set of lettered choices below refers to the numbered questions or statements
immediately following it. Select one lettered choice that best answers each question. A choicemay
be used once, more than once, or not at all in each set.
Questions 33-37
A.
B.
C.
D.
Light-dependent reactions photosynthesis
Light-independent reactions chemosynthesis
Krebs cycle  inner membrane of mitochondria – 2 ATP -6 NADH – 2 FADH2
Glycolysis
33. It occurs in the cytoplasm. D
34. Water is broken down. A
35. Pyruvate is the product. D
36. Sugar is produced. B
37. Oxygen is released. A
38. Red blood cells are placed in three solutions of different concentrations. The microscopic
observations of these cells are done and the results are shown in the following table.
Solution number
Concentration of the
solution (g/cc)
Aspect of red blood
cells
1
0.03
Red blood cells bulge
and lyse hypotonic
2
0.09
3
26
Red blood cells
remain normal
isotonic
Red blood cells
Shrink
Hypertonic
Taking into consideration that the cytoplasm of red blood cells has a concentration of 9 g/100 cc,which
statement is INCORRECT?
A. The red blood cells lyse in medium 1 because the water passes through osmosis fromthe
exterior hypotonic medium into the interior hypertonic medium.
B. Red blood cells undergo hemolysis in medium 1 due to the flux of water from the
extracellular medium towards the intracellular medium.
C. The red blood cells remain normal in solution 2 because both the intracellular and
extracellular media are isotonic.
D. The red blood cells shrink in medium 3 because water exits from the hypotonic mediumto
the hypertonic medium.
E. The red blood cells cannot lyse in medium 3 because there is no exchange that occurs
between the two media.
39. A laboratory technician ‫ فني معمل‬started observing cells during their division. He observed
chromosomes moving towards two different poles ‫جانبين‬of the cell. He called this polar
ascension.
In which phase is polar ascension observed?
Cell poles  sides = anaphase
Cell equator  middle part = metaphase
A.
B.
C.
D.
E.
Prophase
Metaphase
Anaphase
Telophase
Interphase
40. Red blood cells are placed in three solutions of different concentrations. The
microscopicobservations of these cells are done and the results are shown in the
following table:
Solution number
Concentration of
the solution in %
(g/cc)
Aspect of red blood
cells
1
0.03
2
0.09
3
26
Red blood cells
bulge and lyse
Hypotonic
Red blood cells
remain normal
isotonic
Red blood cells
shrink
hypertonic
We consider that the cytoplasm of red blood cells has a concentration of 9
grams/100cc.which statement is INCORRECT?
A. The red blood cells lyse in solution 1 because the water passes by osmosis from
theexterior hypotonic medium into the interior hypertonic medium
B. The red blood cells lyse because the cytoplasmic concentration is less than
that ofsolution 1 thus leading to enormous turgidity
C. The red blood cells remain normal in solution 2 because both the intracellular
andextracellular media are isotonic
D. The red blood cells shrink because water exits from the hypotonic medium to
thehypertonic medium by plasmolysis in solution 3
E. The red blood cells don’t lyse because there is no exchange that occurs between
thetwo media in solution 2
41. A cell was taken from the apical meristem of onion root tips and cultured in a suitable
medium where they undergo normal cell division. Microscopic observations are
continuously done and show that the time spent during metaphase is 14 min, during
prophase 14 min, during interphase 642 min, during anaphase 7 min and during telophase
7 min. The number of cells produced after some time is 32 cells considering that at t0 the
cells were in interphase. The time required to produce these cells is approximately:
A.
B.
C.
D.
E.
24 hours
60 hours
30 hours
46 hours
96 hours
Questions 42-43:
The following figure represents the action of an enzyme on a substrate.
Enzyme active site  hole
Substrate binding site  long thing
42. X, Y, and Z are respectively:
A.
B.
C.
D.
E.
Enzyme, product, substrate
Product, enzyme, substrate
Substrate, enzyme, product
Product, substrate, enzyme
Enzyme, substrate, product
43. The type of reaction catalyzed by this enzyme is:
A.
B.
C.
D.
E.
Synthesis reaction making or building
Decomposition reaction breaking down
Mechanical break down crashing-smashing
Neutralization reaction PH
Displacement reactionreplacment
Questions 44-48:
The three circles represent three major processes in aerobic respiration.
Glucose  glycolysis  krebs cycle  ETC
2 ATP
2 ATP
34
44. Process A represents:
A.
B.
C.
D.
E.
Glycolysis
The Krebs cycle
The electron transport chain
Alcohol fermentation
Lactic acid fermentation
45. Process A occurs in:
A.
B.
C.
D.
E.
Mitochondria
Chloroplasts
The nucleus
The cytoplasm
Different organelles in different cells
46. Process C represents:
A.
B.
C.
D.
E.
Glycolysis
The Krebs cycle
The electron transport chain
Alcohol fermentation
Lactic acid fermentation
47. Which process (es) produce (s) the most amount of energy?
A. A
B. B
C. C
D. A and B
E. A and C
48. Which is true about process C?
A.
B.
C.
D.
E.
Energy is produced by substrate level phosphorylation
It is universal. It is the way all organisms produce energy
It involves the membrane structure ATP synthetase
It only occurs in animals, not plants
It results in the by-product pyruvic acid
49. The site of cellular respiration in the eukaryotic cells is called:
Cellular respiration  breakdown of glucose and get energy 38ATP
A.
B.
C.
D.
E.
Smooth endoplasmic reticulum
Golgi bodies
Mitochondria
Ribosomes
Chloroplasts
50. The germ cell of drosophila has 8 chromosomes, at the end of meiosis I each of the daughter
cells obtained has
At the end of Meiosis I two haploid cells ( half number of chromosoes
A. 8 chromosomes made up of 2 chromatids.
B. 8 chromosomes made up of 1 chromatid.
C. 16 chromosomes made up of 2 chromatids.
D. 4 chromosomes made up of 2 chromatids.
51. When a red blood cell is placed in a hypotonic solution,
Hypo  swell
Hyper  shrink
A.
B.
C.
D.
E.
The cell swells and bursts since water flows into the cell.
The cell shrinks since the water flows outside the cell.
The cell maintains its shape since water diffuses in and out of the cell.
The cell swells and bursts since water flows outside the cell.
The cell shrinks since water flows into the cell.
52. Which of the following statements is NOT true about plant mitosis?
I.
II.
III.
IV.
A.
B.
C.
D.
E.
A cleavage furrow is formed in the middle of the cell during cytokinesis.(animal _
A cell plate is formed in the middle of the cell during cytokinesis. (plant )
The centromere divides and sister chromatids separate to opposite poles of the cell. (plant _
Centrioles change into asters and migrate to opposite poles of the cell during
prophase. (animal )
I only
II only
I and IV
II and IV
II, III and IV
Questions 53 and 54
Directions: Each set of lettered choices below refers to the numbered questions or statements
immediately following it. Select one lettered choice that best answers each question. A choice
may be used once, more than once, or not at all in each set.
A.
B.
C.
D.
E.
Alcoholic fermentation  anaerobic respiration happens in bacteria
Lactic acid fermentation  anaerobic respiration happens in muscles and yeast
Glycolysis  in cytoplasm in presence or abscnece of oxygen
Krebs cycle  mitochondrial matrix
Calvin cycle  plants
53. It occurs during strenuous exercise when the body cannot keep up with the demand of
oxygen. B
54. It occurs in the cytoplasm where one glucose molecule is broken apart into two molecules
of pyruvate. C
55. A phase of cellular respiration that occurs in the cristae ( inner membrane ) of mitochondria is
A.
B.
C.
D.
E.
Glycolysis
Krebs cycle
Electron transport chain
Calvin cycle
Fermentation
56. The amount of DNA in a cell obtained at the end of mitosis is 3.3 a.u.
A. The amount of DNA in this cell is 6.6 a.u during G2 of Interphase and 3.3 a.u
duringG1 .
B. The amount of DNA in this cell is 6.6 a.u during G1 of Interphase and 3.3 a.u during
G2 .
C. The amount of DNA in this cell is 6.6 a.u during G1 and S – phase of Interphase.
D. The amount of DNA in this cell is 3.3 a.u during G1 and S – phase of Interphase.
E. The amount of DNA in this cell is 6.6 a.u during G2 and beginning of S – phase of
Interphase.
57. Chlorophyll b has
A.
B.
C.
D.
E.
Yellow, green
Green, brown
Orange, red
Green, yellow
Green, orange
color and fucoxanthin has
color.
58. Sacs of hydrolytic enzymes that play a role in apoptosis of the cell are
A. Ribosomes  two subunits large w small for protiens making
B. Mitochondria  doubles membrane organelle energy making – has its own dna – can
divide
C. Nucleolus  ribosomes – mrna making
D. Vacuole  storage
E. Lysosomes
59. When the plant is found in a dry area, the guard cells of the stomata
A.
B.
C.
D.
E.
Become turgid and open to increase transpiration
Become turgid and close to stop transpiration
Maintain their shape and close to stop transpiration
Become flaccid and open to increase transpiration
Become flaccid and close to stop transpiration(losing water )
60. The uptake of large dissolved molecules by the cell which requires energy is
A.
B.
C.
D.
E.
Phagocytosis
Pinocytosis
Exocytosis
Osmosis
Diffusion
The following figure shows a cell during one of the phases of mitosis.
61. The phase of mitosis shown in the above figure is
A.
B.
C.
D.
E.
Telophase
Anaphase
Metaphase
Prophase
Cytokinesis
62. By the end of mitosis of the above cell,
A.
B.
C.
D.
2 daughter cells having 4 chromosomes of 2 chromatids are produced
2 daughter cells having 4 chromosomes of 1 chromatid are produced
4 daughter cells having 2 chromosomes of 2 chromatids are produced
2 daughter cells having 2 chromosomes of 1 chromatid are produced
E. 2 daughter cells having 8 chromosomes of 1 chromatid are produced
63. The following figure shows a beaker containing water and solute separated by a selectively
permeable membrane. What would happen after a few minutes?
A.
B.
C.
D.
E.
Osmosis of water from medium 1 to medium 2 takes place.
Diffusion of the solute from medium 1 to medium 2 takes place.
Osmosis of water from medium 2 to medium 1 takes place.
Diffusion of the solute from medium 2 to medium 1 takes place.
Nothing changes.
Questions 64 and 65
The graph below shows the variation of the amount of oxygen used by the cell as a function of the
intensity of exercise.
64. Referring to the data from the above graph, we can conclude that
I. As the exercise becomes difficult, the body relies more on lactic acid fermentation.
II. Low intensity exercises do not require increased oxygen uptake.
III. Difficult exercise requires additional oxygen in order to generate extra ATP for
muscles.
IV. During exercise the body relies only on the aerobic pathway.
A.
B.
C.
D.
E.
I only
III only
I and II
II and IV
I, II and IV
65. How can you explain the plateau (constant) of oxygen consumption.
I. Very high intensity exercise does not require increased amount of oxygen.
II. Red blood cells are saturated with oxygen and can’t bind more oxygen molecules
III. The body uses CO2 instead of O2 when doing very high intensity exercises.
A.
B.
C.
D.
E.
I only
II only
III only
I and II
II and III
66. Snails are hermaphrodites. Each snail has both male and female genitalia. Assume
thateach snail lays 40 eggs in theory; the number of eggs laid by five couples would
be:
A. 80
B. 200
C. 240
D. 320
E. 400
67. The diploid number of chromosomes in an insect cell is 2n=6. The following figure
showsa cell taken from the testicles of this insect during spermatogenesis.
This cell is in:
A.
B.
C.
D.
E.
Meiosis I = metaphase I segregation combining of alleles
Meiosis II
Multiplication phase
Growth phase
Spermiogenesis
68. During lactic acid fermentation, the conversion ‫تحويل‬of the pyruvic acid to lactic acid:
Produce 2 ATP only
A.
B.
C.
D.
E.
Needs an oxidation reaction of the pyruvate to lactate by the NADH2
Needs a reduction reaction of the pyruvate to lactate by the NADH2
Needs an oxydo-reduction reaction of the pyruvate to lactate by the NADPH2
Is accompanied by the synthesis of one mole of ATP
Can’t happen in the absence of oxygen
69. Given the following experiments done in two test tubes ‫انبوبه اختبار‬:
Reaction with
Fehling solution
(done 30 min
later)
Tube 1: 10 ml of
starch solution 1%
+ 1 ml of salivary
amylase solution at
room temperature
Tube 2: 10 ml of
starch solution
1% + 1 ml of
salivary amylase
solution heated at
150oC
Tube 2 brought to
room temperature
again
+
-
-
What can you deduce from the above experiments?
A.
B.
C.
D.
E.
Amylase enzyme doesn’t work at room temperature.
High temperature deactivates the enzyme.  lower temp.
High temperature destroys ‫اتحطم واتهدم‬the enzyme.--> denaturate = destroy ‫دايما مع الحراره‬
High temperature has no effect on the enzyme activity.
Insufficient data
70. The complete oxidation of one mole of NADH2 gives:
A.
B.
C.
D.
E.
45 kJ
60 kJ
90 kJ
135 kJ
180 kJ
71. During karyotype preparation, the dividing cells are blocked at:
A.
B.
C.
D.
E.
Prophase
Metaphase
Anaphase
Telophase
Interphase
72. Which of the following propositions ‫ اقتراحات‬is INCORRECT?
A. The hydrolysis of ATP needs ATPase.
B. The hydrolysis of ATP gives ADP+ Pi+ energy.
C. The synthesis of ATP is made in the ribosome.
D. The synthesis of ATP is made from ADP+ Pi.
E. ATP is a molecular vector of energy.
Questions 73-75:
Five beakers are used in an experiment about osmosis. Each beaker contains 50
ml of a sucrose solution of varying concentration. Pieces of fresh potato (each
10 g in mass) are cut up, weighed, and placed into the beakers. After 12 hours,
the potatoes are carefully removed from each beaker and weighed again. See
the data in the table below.
Beaker
1hypo
2hypo
3slight hypo
4 hyper
5hyper
Concentration of
sucrose solution
0.2 M
0.4 M
0.6 M
0.8 M
1.0 M
Mass of potato at
time zero
10 g
10g
10 g
10 g
10 g
Mass of potato after
12 hours
13.6 g
11.5 g
10.8 g
9.4 g
8.2 g
73. In this experiment:
A.
B.
C.
D.
Water flowed into the potato only.
Water flowed out of the potato only.
Sucrose flowed into the potato only.
Sucrose flowed both into and out of the potato depending on
the concentration ofsucrose solution.
E. Water flowed both into and out of the potato depending
on the concentration ofsucrose solution.
74. Given the results of this experiment, what is the molarity (concentration)
within the potatocell?
A.
B.
C.
D.
E.
Less than 0.2 M
Less than 0.4 M but greater than 0.2 M
Less than 0.6 M but greater than 0.4 M
Less than 0.8 M but greater than 0.6 M
Greater than 0.8 M
75. The results of this experiment give support to the theory that:
A.
B.
C.
D.
E.
Water diffuses down a gradient.
Water can be actively transported against a gradient.
Solutes will diffuse from high concentration to low concentration.
Living cells respond in different ways to the same conditions.
Potato cells respond differently from other living cells.
76. Which of the following statements is NOT true about plant mitosis?
V. A cleavage furrow is formed in the middle of the cell during
cytokinesis.(animal _
VI. A cell plate is formed in the middle of the cell during cytokinesis. (plant )
VII. The centromere divides and sister chromatids separate to opposite poles of the
cell. (plant _
VIII. Centrioles change into asters and migrate to opposite poles of
the cell duringprophase. (animal )
F.
G.
H.
I.
J.
I only
II only
I and IV
II and IV
II, III and IV
77. Grade 12 students measure the enzyme activity on a substrate at various
temperatures ofpH=3.
Based on the data, what results can be predicted if the experiment is carried out at
62oC?\
Enzyme  low temp  deactivate ‫ممن يرجع يشتغل‬
Optimum temp  max. product
High temp  denatuarate ‫بيبوووظ بال رجعه‬
A.
B.
C.
D.
E.
No prediction would be valid.
An amount of product equal to that at 20oC would form.
An amount of product equal to that at the optimum temperature would form.
An amount of product equal to that at 5oC would form.
Little or no product would form.
78. Puromycin is an antibiotic that can block protein synthesis of bacteria without
harming itseukaryotic host. This phenomenon is caused
A.
B.
C.
D.
by prokaryotic cells that have membrane-bound organelles.
when eukaryotic DNA is linear while prokaryotic DNA is circular.
in prokaryotes where translation can occur at the same time as transcription.
when there is much more space within a eukaryotic cell than within a prokaryotic
cell.
E. when prokaryotes have ribosomes that are much smaller and simpler than
eukaryotes.