Dr.

Nesreen Medhat
01004677030 Cell transport

1. A plant cell is placed in a hypotonic solution. As a result, the cell will

A. lyse
B. Swell but remain intact
C. Shrivel
D. Remain unchanged
E. Take up solutes

2. The exchange of O2 and CO2 between blood and air in the lungs occurs through the process of
A. Diffusion
B. Osmosis
C. secretion
D. active transport
E. pinocytosis

3. Osmoregulation is the maintenance of

A. Three germ layers
B. Body symmetry
C. A balance of water and ions
D. Reproductive fertility
E. Extraembryonic membranes

4. Cells of a living organisms are able to keep substances against concentration gradient by
A. Osmosis
B. Diffusion
C. Dialysis
D. Active transport
E. Transpiration

5. When the plant cell are placed in salt water solution, the volume of the cytoplasm decreases. Which
of the following is the best explanation for this observation
A. Cytoplasm leaks out through the cell wall
B. The organelles in the cytoplasm are destroyed as the water enters the cell
C. The water especially in the vacuole leaves the cell
D. Water from outside the cell fills the space between the cell wall and the plasma membrane
E. The nucleus explodes and therefore take up less space in the cytoplasm

6. Thyroid cells need to maintain a high concentration of iodide in order to produce the hormone
thyroxin. Which of the following is most likely about the flow of iodide into the thyroid cells?
A. The iodide passively diffuses through the cell membrane into the thyroid cells requiring no ATP
B. The iodide passively diffuses through specialized channels in the cell membrane, requiring no ATP
C. The iodide is transported into the Golgi apparatus of the thyroid cells requiring ATP
D. The iodide flows into the cell by osmosis requiring no ATP
E. The iodide is actively transported through the cell membrane requiring ATP
Dr.Nesreen Medhat
01004677030 Cell transport

7. An animal cell placed into a 0.9% solute solution would do which of the following?
A. Remain unchanged
B. Swell and burst
C. Shrivel
D. Swell and divide
E. Release solute by exocytosis

8. Which of the following can most readily diffuse unassisted through a cell membrane?
A. Hemoglobin
B. sucrose
C. ATP
D. DNA
E. Oxygen

9. Which of the following types of cells is most likely to be engaged in the process of exocytosis?
A. A muscle cell during contraction and relaxation
B. A pancreas cell during the secretion of digestive enzymes
C. A liver cell during the metabolism of glucose
D. A kidney cell during the reabsorption of sodium
E. A bone marrow cell during the synthesis of hemoglobin

10. What would happen to a blood cell moved from an isotonic solution to a hypertonic solution?
A. The cell would swell.
B. The cell would shrivel up.
C. The cell would immediately lyse.
D. The cell membrane would be reinforced.
E. Nothing; the cell would be in equilibrium.

11. The fluid surrounding human blood cells contains fewer potassium ions (K+ ) than sodium ions (Na+).
Yet the cytoplasm of the blood cells contains more K ' than Na+. The most likely reason for this
difference is that
A. Cells are permeable to K+ but not to Na+
B. Both K + and Na+ enters cells by osmosis
C. Cells convert Na+ to K+ enzymatically
D. Cells pump K + in and Na +out by active transport
E. K + crystallizes inside cells and cannot diffuse out

12. Carrot sticks that are left in a dish of freshwater for several hours become stiff and hard. Similar
sticks left in a saltwater solution become limp and soft. From this we can deduce that the freshwater is
______ and the saltwater is ________ to the cells of the carrot sticks.
A. hypotonic, hypertonic
B. hypotonic, hypotonic
C. hypertonic, hypotonic
D. hypertonic, hypertonic
Dr.Nesreen Medhat
01004677030 Cell transport

13. In an emergency trauma room, a doctor accidentally gives a patient a large transfusion of distilled
water directly into one of his veins instead of blood. Predict what might happen if distilled water was
given to the patient instead of blood.
A. have no unfavorable effect as long as the water was sterile
B. have serious, perhaps fatal effects because there would be too much fluid for the heart to pump.
C. have serious, perhaps fatal effects because the red blood cells would tend to shrivel
D. have serious, perhaps fatal effects because the red blood cells
would tend to burst

14. The process depicted in the picture is called

A. Phagocytosis
B. Cytoplasmic streaming
C. Exocytosis
D. Pinocytosis
E. osmosis

15. When Streptococcus pneumoniae are exposed to an antibiotic, the bacteria try to pump the antibiotic
out of their cells. Which of the following mechanisms is most likely used by the Streptococcus
pneumoniae to pump the antibiotic out of their cells?
A. active transport
B. diffusion
C. facilitated diffusion
D. osmosis
Dr.Nesreen Medhat
01004677030 Cell transport

Questions 17-18 A student cut three potato pieces weighing 10.0g each and placed each in a different
beaker containing different salt concentrations. The physiological concentration of the potato cell is
4.6%. Refer to the figure below and your own knowledge to answer the following questions.

17. After 2 hours, the student removed one of the potato pieces form one of the beakers and weighed
it. The potato piece weighed 12.2g. Which beaker was this piece taken from?
A. A
B. B
C. C
D. The data given is not enough for a definite answer.
E. It could be either beaker A or B.

18. What kind of change would the potato in beaker B go through?

A. The potato will increase in weight.
B. Turgid pressure will increase causing the potato cells to burst.
C. No change will occur since the amount of water flowing in and out of the cell is the same.
D. Plasmolysis will occur due to dehydration.
E. Salt will enter the potato cells since the amount of salt outside is more than the salt inside.

19. The bar graph below shows relative differences in certain ions inside and outside of a
typical animal cell.
The difference in Na+ concentrations inside and
outside of a typical animal cell is a result of
(A) pinocytosis
(B) bulk transport
(C) osmosis
(D) active transport
(E) diffusion

20. Based on the bar graph, which of the following is

a complete list of the ions that are pumped into the
cell?
(A) H+
(B) K+ and Mg2+
(C) Mg2+ and Cl-
(D) Na+ and Cl-
(E) Na+ and K+
Dr.Nesreen Medhat
01004677030 Cell transport

21. Energy is most likely required to maintain the cellular concentrations of

(A) Na+ and Cl- only
(B) Na+ and K+ only
(C) K+ and Mg2+ only
(D) Na+, K+, Mg2+, and Cl- only
(E) Na+, K+, Mg2+, H+, and Cl-

22----24. Dialysis tubing was used to make a series of a membrane bags with various starch
solutions (0 %, 1 %, 2%, 4% and two filled with 20mL of one of the starch solutions and then
the mass of each bag was measured. The bags were then placed into beakers containing 100
mL of distilled water for 30 minutes. After 30 minutes, the mass of each bag and the percent
change in mass were determined. The bags were permeable to water but not to starch

Solution in Bag Percent Change in Mass of Bag

0.0 % starch +0.1%
1.0% starch +3.2%
2.0%starch +6.0%
4.0 % starch +11.8%
Solution X +5.8%
Solution Y +9.1%

22. Which of the following processes most likely occurred across the membranes in each of the
bags?
A. Diffusion
B. Osmosis
C. Active transport
D. Facilitated diffusion
E. Plasmolysis

23. Which of the following is closest to the approximate concentration of solution X?

A. 0 % starch
B. 1.0% starch
C. 2.0% starch
D. 3.0% starch
E. 4.0 % starch

24. Which of the following is closest to the approximate concentration of solution Y?

A. 0 % starch
B. 1.0% starch
C. 2.0% starch
D. 3.0% starch
E. 4.0 % starch
Dr.Nesreen Medhat
01004677030 Cell transport

25----27Five beakers are used in an experiments about osmosis. Each beaker contains 50 mL of
a sucrose solution of varying concentrations: 0.2M, 0.4M, 0.6M, 0.8M or 1.0M. Pieces of fresh
potato (each 10.0g in mass) are cut, weighted and placed into the beaker. After 12 hours the
potato are carefully removed from each beaker and weighted again.

See the data in table below

Beaker Concentration of sucrose Mass of potato at time zero Mass of potato after 12
solution hours
1 1.0 M 10.0 g 8.2 g
2 0.8 M 10.0 g 9.4 g
3 0.6 M 10.0 g 9.8 g
4 0.4 M 10.0 g 11.5 g
5 0.2 M 10.0 g 13.6 g
25. In this experiment

A. Water flows into the potato only

B. Water flows out of the potato only
C. sucrose flows into the potato only
D. sucrose flows both into and out of the potato
E. water flows both into and out of the potato
26. What is the molarity (concentration) within the potato cells?

A. Less than 0.2M

B. Less than 0.4M but greater than 0.2M
C. Less than 0.6M but greater than 0.4M
D. Less than 0.8M but greater than 0.6M
E. Greater than 0.8M
27. The result of this experiment give support to the theory that

A. Water diffuses down a gradient

B. Water can be actively transported against a gradient
C. Solutes will diffuse from high concentration to low concentration
D. Living cells respond in different ways to the same condition
E. Plant cells respond differently from other living cells
28. if the cell lost its ability to bump the ions across cell membrane, solute concentration inside
will be greater than outside. What will be the effect on the transfer of water?
a) Move in by osmosis
b) Move in by active transport
c) Move out by osmosis
d) Move out by active transport
Dr.Nesreen Medhat
01004677030 Cell transport

29--30 Three blood samples are prepared according to the following procedure.

Slides are made of each sample and the cells are viewed microscopically. The concentration of
solutes in the solution used in preparing sample X is the same as that of the red blood cells.
29. The blood cells in sample Z would
(A) Look the same as those in solution Y
(B) Undergo lysis
(C) Shrink
(D) Exhibit turgor pressure
(E) Show wilting

30. Which of the following is true regarding the blood cells in sample Y?
(A) The cells would look like those in sample X when viewed microscopically.
(B) The cells would lose water to the surrounding solution.
(C) The concentration of the Na + and Cl- ions in the cells would decrease.
(D) The amount of Na + entering the cells will equal the amount of Cl- leaving the cells.
(E) The cells would swell.

31) A bag of 20% sucrose with a permeable membrane was placed in distilled water for an hour
then removed and dried off. Which of the following is correct about the mass of the bag before
and after it placed in water?
A. Become heavier, because water entered the bag.
B. Become lighter, because water exited the bag.
C. Become heavier, because sucrose exited.
D. Become lighter, because sucrose entered the bag.

32) there is a plant in normal environment. And this plant watered by normal water. Then we
started to water it by salt water. After one week, what did turgid pressure in plant cells more
likely to be lower or higher?
A. turgid pressure will be higher because the plant cell will experience a net gain of water.
B. turgid pressure will be lower because the plant will experience a net loss of water.
C. turgid pressure will be higher because the plant will experience a net loss of water.
D. turgid pressure will be lower because the plant will experience a net gain of water.
Dr.Nesreen Medhat
01004677030 Cell transport

33) after action potential, Na_K pump regulate ions through neuron membrane by:
a) simple diffusion.
b) active transport
c) facilitated transport.
d) osmosis.
34) if the cell lost its ability to pump the ions across cell membrane, solute concentration inside
will be greater than outside. What will be the effect on the transfer of water?
a) move in by osmosis.
b) move in by active transport.
c) move out by osmosis.
d) move out by active transport.

35) glucose concentration in blood is 10 times higher than in some cells in the body. Which of
the following processes explain how the glucose move from blood to cells.
a) active transport.
b) facilitated diffusion.
c) osmosis
d) simple diffusion.

36) A student observed that when red blood cells were added to a tube containing distilled
water the cells swelled and eventually burst. Which of the following statements best explains
why the cell burst?
The salt concentration was higher….
A. Inside the cells than outside the cell, so more water diffused out of the cells than into the
cells
B. Outside the cells than inside the cell, so more water diffused out of the cells than into the
cells
C. Inside the cells than outside the cell, so more water diffused into the cells than out of the
cells
D. Outside the cells than inside the cell, so more water diffused into the cells than out of the
cells

37) contractile vacuole exit water out of the Protista cell, when the medium out of the cell is
a) hypotonic
b) hypertonic
c) isotonic
d) none of the above

38. The process by which water diffuses through a selectively permeable membrane is known
as
A. diffusion.
B. osmosis.
C. active transport.
D. transpiration.
Dr.Nesreen Medhat
01004677030 Cell transport

E. evaporation

39 A cucumber is placed in ajar containing a salt solution. After few days, the cucumber shrinks.
What is the probable reason behind the shrinkage of the cucumber?
A. The cucumber is placed in a hypertonic solution, so water diffuses outside the cucumber
cells,
B, The cucumber is placed in a hypotonic solution, so water diffuses outside the cucumber cells,
C, The cucumber is placed in a hypertonic solution, so water diffuses inside the cucumber cells.
D. The cucumber is placed in a hypotonic solution, so water diffuses inside the cucumber cells.
E* The cucumber is placed in an isotonic solution, so water diffuses outside the cucumber cells.

40—41.Plant cells were cultured in media containing different concentrations of sucrose. The rate of
sucrose uptake by the plant was measured for different concentrations of sucrose, and the results are
represented in the graph below.

40. The above graph shows that when the concentration of sucrose increases from 10 mmol/L
to 30 mmol/L:
A the rate of sucrose uptake increased slowly,
B, the rate of sucrose release increased slowly,
C, the rate of sucrose uptake increased rapidly.
D, the rate ofsucrose release increased rapidly,
E the cells failed to absorb sucrose.

41.Which information can be derived from the above graph?

A. The rate of sucrose uptake increased rapidly from 0 to 30 mmol/L,
B. The rate of sucrose uptake increased slowly from 0 to 30 mmol/L.
C. The rate of sucrose uptake increased slowly from 0 to 10 mmol/L.
D. The rate of sucrose uptake was constant between 10 and 30 mmol/L.
E. The rate of sucrose uptake was constant between 30 and 40 mmol/L.