M6 - Transport Of Substances Across Cell Membrane

Question 1

The nephron reabsorbs glucose through a sodium / glucose transporter. What sort of transporter is it?

a. Protein channel
b. Antiporter
c. Sodium pump
d. symporter

Answer 1

Ans : D

Question 2

What cell membrane property in the nephron capillaries allows small molecules to pass through?

A. It has cholesterol rafts

B. It has glycoprotein channels

C. It has fenestrations

D. It is amphipathic

Answer 2

Ans : C

Question 3

Which of the following would slow sugar equilibrium the most once the shutter is raised to connect the two solutions?

A. Adding salt to side B

B. Lowering the temperature

C. lower the water concentration in side A

D. Increasing the water volume in side B

Answer 3

Ans : B

Question 4

Cholera affects millions of people around the world. It causes diarrhea, which can lead to dehydration and even death. Cholera toxin affects a chloride transporter that secretes chloride ion into the lumen of the small intestine. How does cholera toxin lead to dehydration?

A. The toxin turns off the transporter, so the negatively charged chloride pushes water into the lumen

B. The toxin turns on the transporter, and water follows the ion due to osmosis

C. The toxin turns on the transporter, and water is actively transported with the ion

D. The toxin turns off the transporter, so water is no longer exchanged for chloride ion

Answer 4

Ans : B

Question 5

How do potassium ions travel as they move into the cell?

A. Down the concentration gradient and up the membrane potential

B. Up the concentration gradient and down the membrane potential

C. Down the concentration gradient and down the membrane potential

D. Up the concentration gradient and up the membrane potential

Answer 5

Ans : B

Question 6

A cell is injected with ion X and placed into a solution. The following potentials are measured inside and outside the cell, yet there is no net flow of X ions. Why?

(Choice A)
A. X must be transported via facilitated diffusion, but there is no transport protein

(Choice B)
B. There is no permeability for X

(Choice C)
C. X is a cation, so it remains in the cell

(Choice D)
D. X must be transported via active transport, and there is no ATP

Answer 6

Ans : C

Question 7

Selective serotonin reuptake inhibitors (SSRIs), used to treat depression, block a specific protein in the pre-synaptic neuron to keep the neurotransmitter in the synaptic cleft for a longer period of time. What sort of protein do they block?

(Choice A)
A. A neurotransmitter ATP pump

(Choice B)
B. A phagocytosis-inducing protein

(Choice C)
C. A sodium-neurotransmitter symporter

(Choice D)
D. A neurotransmitter channel

Answer 7

Ans : C

Question 8

What sort of transporters would be required to move glucose from the blood to the lumen?

(Choice A)
A. Apical sodium/glucose symporter and basolateral sodium/potassium pump and glucose channel

(Choice B)
B. Apical glucose channel and basolateral sodium/potassium pump and sodium/glucose symporter

(Choice C)
C. Apical glucose channel and basolateral sodium/potassium pump and sodium/glucose antiporter

(Choice D)
D. Apical sodium/glucose antiporter and basolateral sodium/potassium pump and glucose channel

Answer 8

Ans: D

Question 9

Immune system cells use damaging proteases and reactive oxygen species to destroy foreign invaders. The immune system cells are not harmed because the microbes are sequestered in vesicles. How did the invaders get to the vesicles?

(Choice A)
A. Active transport

(Choice B)
B. Phagocytosis

(Choice C)
C. Exocytosis

(Choice D)
D. Pinocytosis

Answer 9

Ans : B

Question 10

Pulmonary edema occurs when fluid builds up in the interstitium between the pulmonary capillaries and the alveoli, and eventually enters the alveoli. How do you decrease the risk of pulmonary edema?

(Choice A)
A. Decrease hydrostatic pressure and increase osmotic pressure

(Choice B)
B. Increase hydrostatic pressure and decrease osmotic pressure

(Choice C)
C. Decrease hydrostatic pressure and decrease osmotic pressure

(Choice D)
D. Increase hydrostatic pressure and increase osmotic pressure

Answer 10

ans : A

Question 11

1. Why is transport across the plasma membrane necessary?

A. transport of substances for metabolic activities
B. movement of waste product out of cell
C. movement of substances produced by cells
D. all of the above

Answer 11

Ans : D

Question 12

2. Which of the following methods does not require any carrier or channel for transport of substances?

A. secondary active transport
B. facilitated diffusion
C. simple diffusion
D. primary active transport

Answer 12

Ans : C

Question 13

3. Which substances are transported through facilitated diffusion?

A. galactose
B. urea
C. oxygen
D. alcohol

Answer 13

Ans : A

Question 14

5. Which type of movement occurs when Na/K pump is used?

A. Na ions moves out of the cell and K+ move in
B. K+ ion moves out of cell and Na ion move in
C. both Na and K+ ions move inside the cell
D. both Na and K+ move out of the cell

Answer 14

Ans : A

Question 15

7. Which of the following statement is NOT true?

A. chemical changes leads to change in shape of pump
B. symporters are the one which moves substances in diff direction
C. Vitamin K is transported through simple diffusion
D. in passive transport, the substance moves down its concentration gradient

Answer 15

Ans : B

Question 16

8. Which substance is transported through secondary active transport?
A. urea 
B. water
C. O 2 
d. none of the above

Answer 16

And :D

Question 17

9. What is the source of energy in active transport?

A. from sunlight
B. hydrolysis of ATP
C. energy stored in ionic concentration gradient
D. both B and C

Answer 17

Ans : D

Question 18

10. In what case, the transporters are known as antiporters?

A. when 2 substances move in same direction
B. when 2 move in same direction and 1 in opposite
C. when 3 move in same direction
D. when 2 substances move in opposite direction

Answer 18

Ans : D