PSL 425 FINAL EXAM MULTIPLE CHOICE 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+.
What is the driving force that determines the passive transport of solutes across a permeable
membrane? - (ANSWER)The electrochemical gradient
When a substance is uncharged, as in the case of glucose, when can equilibrium occur? - (ANSWER)Only
when the concentration is equal on the two sides of the membrane
If neither the chemical nor the electrical term in the electrochemical potential energy difference
equation is zero, when can equilibrium occur? - (ANSWER)The two terms are equal but of opposite sign
Which of the following values is unnecessary when finding the equilibrium potential of an ion using the
Nernst equation? - (ANSWER)The membrane voltage
What does the Nernst equation predict for any concentration gradient of a particular ion across a
membrane? - (ANSWER)The equilibrium potential
If movement of a substance across the membrane is not directly coupled to the movement of any other
solute or to any other chemical reaction, this transport is called? - (ANSWER)Noncoupled transport
How is the net flux best determined in terms of influx and efflux? - (ANSWER)The sum of influx and efflux
What direction will an anion move when the net driving force is negative? - (ANSWER)The anion will exit
the cell
What direction will a cation move when the net driving force is negative? - (ANSWER)The cation will
enter the cell
For equilibrium to occur what must happen? - (ANSWER)The net flux must be zero
, PSL 425 FINAL EXAM MULTIPLE CHOICE 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+.
Which answer correctly orders the Nernst potentials of a neuron at 37°C for potassium, sodium, calcium,
chloride from depolarized to hyperpolarized? - (ANSWER)Ca2+ > Na+ > Cl- > K+
The resting membrane potential is mainly determined by: - (ANSWER)The potassium gradient
What is the name for the movement of a single ion species through the membrane? - (ANSWER)Current
What does the rate of ion movement through the membrane depend on? - (ANSWER)The external and
internal concentrations of the ion
The membrane potential
The permeability coefficient of the ion
The outward flow of Cl- would best be described as a(n): - (ANSWER)Inward current
The inward flow of Na+ would best be described as a(n): - (ANSWER)Negative current
If the membrane is permeable to multiple monovalent ions and only these ions, the total ionic current
would be the ________ of the individual ionic currents. - (ANSWER)Sum
Coulomb's law explains what physical phenomenon? - (ANSWER)Attractive and repulsive electrostatic
forces between two charged particles
What would happen to the equilibrium potential of K+ if the intracellular [K+] decreased? -
(ANSWER)Depolarize
Which factor best attributes to why the plot of Vm versus [K+]o curves away from the idealized Nernst
slope? - (ANSWER)Permeability of sodium
QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+.
What is the driving force that determines the passive transport of solutes across a permeable
membrane? - (ANSWER)The electrochemical gradient
When a substance is uncharged, as in the case of glucose, when can equilibrium occur? - (ANSWER)Only
when the concentration is equal on the two sides of the membrane
If neither the chemical nor the electrical term in the electrochemical potential energy difference
equation is zero, when can equilibrium occur? - (ANSWER)The two terms are equal but of opposite sign
Which of the following values is unnecessary when finding the equilibrium potential of an ion using the
Nernst equation? - (ANSWER)The membrane voltage
What does the Nernst equation predict for any concentration gradient of a particular ion across a
membrane? - (ANSWER)The equilibrium potential
If movement of a substance across the membrane is not directly coupled to the movement of any other
solute or to any other chemical reaction, this transport is called? - (ANSWER)Noncoupled transport
How is the net flux best determined in terms of influx and efflux? - (ANSWER)The sum of influx and efflux
What direction will an anion move when the net driving force is negative? - (ANSWER)The anion will exit
the cell
What direction will a cation move when the net driving force is negative? - (ANSWER)The cation will
enter the cell
For equilibrium to occur what must happen? - (ANSWER)The net flux must be zero
, PSL 425 FINAL EXAM MULTIPLE CHOICE 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+.
Which answer correctly orders the Nernst potentials of a neuron at 37°C for potassium, sodium, calcium,
chloride from depolarized to hyperpolarized? - (ANSWER)Ca2+ > Na+ > Cl- > K+
The resting membrane potential is mainly determined by: - (ANSWER)The potassium gradient
What is the name for the movement of a single ion species through the membrane? - (ANSWER)Current
What does the rate of ion movement through the membrane depend on? - (ANSWER)The external and
internal concentrations of the ion
The membrane potential
The permeability coefficient of the ion
The outward flow of Cl- would best be described as a(n): - (ANSWER)Inward current
The inward flow of Na+ would best be described as a(n): - (ANSWER)Negative current
If the membrane is permeable to multiple monovalent ions and only these ions, the total ionic current
would be the ________ of the individual ionic currents. - (ANSWER)Sum
Coulomb's law explains what physical phenomenon? - (ANSWER)Attractive and repulsive electrostatic
forces between two charged particles
What would happen to the equilibrium potential of K+ if the intracellular [K+] decreased? -
(ANSWER)Depolarize
Which factor best attributes to why the plot of Vm versus [K+]o curves away from the idealized Nernst
slope? - (ANSWER)Permeability of sodium
