Multiple Choice Questions on Membrane Transport MCQ

1. Gases such as oxygen and carbon dioxide cross the cell membrane by

a) passive diffusion through the lipid bilayer

b) primary active transport

c) specific gas transport proteins

d) secondary active transport

2.Carrier proteins are take part in

a)Water transport

b)Active transport of ions

c)Passive transport of ions

d)None of these

3. Which of the following is an example of primary active transport?

a)Cl^--HCO₃^- exchange
b)Na⁺ K⁺ ATPase

c)Na⁺ - H⁺ exchange

d)Na⁺-Ca²⁺ exchange

4. The principal intracellular cation is:
a)Na⁺
b)Ca⁺
c)K⁺
d)Cl^-

5. The sodium pump
a)Exchanges extracellular Na⁺ for intracellular K⁺
b)Is an ion channel
c)Is important for maintaining a constant cell volume
d)Can only be inhibited by metabolic poisons

6.  Which of the following values is closest to the resting membrane potential of mammalian cells:
a)+20 mV
b)-20 mV
c)-60 mV
d)+60 mV

7. Which of the following statements regarding exocytosis is correct?
a)Is always employed by cells for secretion
b)Takes up large molecules from the extracellular space
c)Allows the retrieval of elements of the cell membrane
d)Is used to deliver material into the extracellular space

8. Endocytosis is used by cells to:
a)Ingest bacteria and cell debris
b)Retrieve elements of the cell membrane after exocytosis
c)Secrete large molecules into the extracellular space
d)None of these

9.  Pinocytosis

a)At sites of membrane called coated pits.

b)For large  protein molecule

c)By formation   of pinocytic vesicle.

d)All of these

10. The resting membrane potential is mainly determined by:
a)the K⁺ gradient
b)the Cl^- gradient
c)the Ca²⁺ gradient
d)the Na⁺ gradient

11. Which of the following process requires membrane proteins?

a)Pinocytosis
b)exocytosis

c)Phagocytosis

d)Receptor mediated endocytosis

12. Phagocytosis

a)Is preceded by opsonization

b)Requires presence of Ca²⁺ ions in extracellular fluid.
c)Occurs mainly in leucocytes

d)All of these

Learn more: 

• Notes on Membrane Transport- Passive and Active Transport
• Notes on Exocytosis and Endocytosis (Phagocytosis, Pinocytosis and Receptor Mediated endocytosis)
• Quiz on Cell Membrane (Plasma Membrane)

Answers:
1.a) passive diffusion through the lipid bilayer
2. b)Active transport of ions
3. b)Na⁺ K⁺ ATPase
4. c)K⁺
5. c)Is important for maintaining a constant cell volume
6. c)-60 mV
7. d)Is used to deliver material into the extracellular space
8. b)Retrieve elements of the cell membrane after exocytosis
9. d)All of these
10. a)the K⁺ gradient
11. d)Receptor mediated endocytosis
12. d)All of these

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