Question 1

Which of the following is NOT required to determine equilibrium potential of a particular ion?

Accepted Answer

A)   charge or valence of the ion
B)   concentration gradient for ion across the membrane
C)   temperature
D)   the log of the concentration ratio
E)   size of the ionF) All of the above
G) C) and E)

Question 2

A cell with normal tonicity is placed in a 200 mM NaCl solution. This solution________ is and the cell will________ _.

Accepted Answer

A)   isotonic : not change size
B)   hypotonic : swell
C)   hypertonic : swell
D)   hypotonic : shrink
E)   hypertonic : shrinkF) A) and E)
G) A) and D)

Question 3

The hydrolysis of ATP on the Na+/ K+ pump results in

Accepted Answer

A)   a conformational change that exposes the K+ binding site to the inside of the cell.
B)   a conformational change that exposes the K+ binding site to the outside of the cell.
C)   a conformational change that exposes the Na+ binding site to the inside of the cell.
D)   a conformational change that exposes the Na+ binding site to the outside of the cell.
E)   Na+ adhering to its binding site.F) C) and D)
G) B) and E)

Question 4

What is the primary role for the Na+/ K+ pump?

Accepted Answer

A)   the maintenance of Na+ and K+ concentrations once inside the membrane
B)   the maintenance of Na+ and K+ concentrations on either side of the membrane
C)   to produce ATP while pumping Na+ and K+ against their concentration gradients
D)   to pump Na+ and K+ down their concentration gradients out of the cell
E)   to create a polarized membrane in an excitable cellF) B) and D)
G) All of the above

Question 5

Which of the following will NOT increase the net flux of an ion across a membrane?

Accepted Answer

A)   enhanced surface area
B)   reduced surface area
C)   increased concentration gradient across the membrane
D)   more channels for that ion in the membrane
E)   elevated permeability of the membraneF) None of the above
G) B) and D)

Question 6

The first step of the Na+/ K+ pump's activity involves the binding of which of the following?

Accepted Answer

A)   3 Na+ and 2 K+ to their respective binding sites
B)   3 Na+ to their binding site on the inside of the cell
C)   3 Na+ to their binding site on the outside of the cell
D)   2 K+ to their binding site on the inside of the cell
E)   2 K+ to their binding site on the outside of the cellF) A) and C)
G) None of the above

Question 7

What is responsible for the unequal distribution of ions across a membrane, thereby causing a charge?

Accepted Answer

A)   the semipermeable membrane
B)   the concentration of carrier proteins in the membrane
C)   the concentration of impermeable charged molecules
D)   the concentration of ions seeking equilibrium with respect to their charge
E)   the ability of permeable ions to pass through a membraneF) B) and C)
G) B) and D)

Question 8

Osmosis occurs through aquaporins.

Accepted Answer

A) True 
 B)False

Question 9

If a cell becomes damaged and is temporarily unable to produce ATP, what is the likely outcome with respect to H2O?

Accepted Answer

A)   no change in water movement, as the anionic proteins lose their charge and can no longer create a membrane potential
B)   dehydration, as water must be pumped in through aquaporins
C)   cellular swelling, as water follows Na+ into the cell
D)   dehydration, as water diffusion is a passive process
E)   no change in water movement, as K+ is exchanged equally for Na+F) A) and E)
G) All of the above

Question 10

White blood cells are an important component of our immune system. One thing they do is consume and destroy bacteria by extending their plasma membrane around the bacterium and bringing it inside the cell in a vesicle. By what process do they engulf the bacterium?

Accepted Answer

A)   pinocytosis
B)   phagocytosis
C)   exocytosis
D)   receptor -mediated endocytosis
E)   transcytosisF) A) and B)
G) C) and D)

Question 11

Which of the following is NOT a determinant of the magnitude and direction of the equilibrium potential for an ion?

Accepted Answer

A)   lipid solubility of the ion
B)   charge of the ion
C)   concentration gradient
D)   chemical driving force
E)   valence of the ionF) A) and B)
G) B) and D)

Exam 4: Cell Membrane Transport

What is responsible for the unequal distribution of ions across a membrane, thereby causing a charge?

Correct Answer
verified

Which of the following is NOT required to determine equilibrium potential of a particular ion?

Correct Answer
verified

Which of the following will NOT increase the net flux of an ion across a membrane?

Correct Answer
verified

The hydrolysis of ATP on the Na⁺/ K⁺pump results in

Correct Answer
verified

White blood cells are an important component of our immune system. One thing they do is consume and destroy bacteria by extending their plasma membrane around the bacterium and bringing it inside the cell in a vesicle. By what process do they engulf the bacterium?

Correct Answer
verified

Osmosis occurs through aquaporins.

Correct Answer
verified

A cell with normal tonicity is placed in a 200 mM NaCl solution. This solution is and the cell will _.

Correct Answer
verified

The first step of the Na⁺/ K⁺pump's activity involves the binding of which of the following?

Correct Answer
verified

Which of the following is NOT a determinant of the magnitude and direction of the equilibrium potential for an ion?

Correct Answer
verified

What is the primary role for the Na⁺/ K⁺pump?

Correct Answer
verified

If a cell becomes damaged and is temporarily unable to produce ATP, what is the likely outcome with respect to H₂O?

Correct Answer
verified

Exam 4: Cell Membrane Transport

What is responsible for the unequal distribution of ions across a membrane, thereby causing a charge?

Correct AnswerverifiedShow Answer

Which of the following is NOT required to determine equilibrium potential of a particular ion?

Correct AnswerverifiedShow Answer

Which of the following will NOT increase the net flux of an ion across a membrane?

Correct AnswerverifiedShow Answer

The hydrolysis of ATP on the Na+/ K+ pump results in

Correct AnswerverifiedShow Answer

White blood cells are an important component of our immune system. One thing they do is consume and destroy bacteria by extending their plasma membrane around the bacterium and bringing it inside the cell in a vesicle. By what process do they engulf the bacterium?

Correct AnswerverifiedShow Answer

Osmosis occurs through aquaporins.

Correct AnswerverifiedShow Answer

A cell with normal tonicity is placed in a 200 mM NaCl solution. This solution________ is and the cell will________ _.

Correct AnswerverifiedShow Answer

The first step of the Na+/ K+ pump's activity involves the binding of which of the following?

Correct AnswerverifiedShow Answer

Which of the following is NOT a determinant of the magnitude and direction of the equilibrium potential for an ion?

Correct AnswerverifiedShow Answer

What is the primary role for the Na+/ K+ pump?

Correct AnswerverifiedShow Answer

If a cell becomes damaged and is temporarily unable to produce ATP, what is the likely outcome with respect to H2O?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The hydrolysis of ATP on the Na⁺/ K⁺pump results in

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A cell with normal tonicity is placed in a 200 mM NaCl solution. This solution is and the cell will _.

Correct Answer
verified

The first step of the Na⁺/ K⁺pump's activity involves the binding of which of the following?

Correct Answer
verified

Correct Answer
verified

What is the primary role for the Na⁺/ K⁺pump?

Correct Answer
verified

If a cell becomes damaged and is temporarily unable to produce ATP, what is the likely outcome with respect to H₂O?

Correct Answer
verified