1 | Page
PSL 425 FINAL EXAM MULTIPLE
CHOICE 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED
ANSWERS.
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
,2 | Page
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
, 3 | Page
For equilibrium to occur what must happen? - ANSWER-The
net flux must be zero
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
PSL 425 FINAL EXAM MULTIPLE
CHOICE 2026/2027 ACTUAL
QUESTIONS WITH VERIFIED
ANSWERS.
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
,2 | Page
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
, 3 | Page
For equilibrium to occur what must happen? - ANSWER-The
net flux must be zero
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
