Wajiha Y, Matt D, Haley G
Sodium-Potassium Pump Quiz 1
1. CORRECT The sodium-potassium pump functions to pump
A) sodium ions out of the cell and potassium ions into the cell.
B) sodium ions into the cell and potassium ions out of the cell.
C) sodium and potassium ions into the cell.
D) sodium and potassium ions out of the cell.
E) sodium and potassium ions in both directions across the cell membrane.
2. CORRECT What is the source of energy used to power the sodium-potassium
pump?
A) breakdown of ATP
B) formation of ATP
C) transport of ATP by the pump
D) breakdown of GTP
E) transport of GTP by the pump
3. CORRECT During one cycle, the sodium-potassium pump binds and moves.
A) 1 Na+ and 2 K+.
B) 2 Na+ and 2 K+.
C) 2 Na+ and 3 K+.
D) 3 Na+ and 2 K+.
E) 3 Na+ and 3 K+.
4. CORRECT The sodium-potassium pump is a trans-membrane protein.
A) True
B) False
5. CORRECT The binding and release of sodium or potassium ions are due to
conformational changes in the protein.
A) True
B) False
Sodium Potassium Pump Quiz 2
1. CORRECT Which of the following statements are not true about the sodium
potassium pump?
A) The ions from the intracellular fluid plus an ATP molecule bind to the
carrier protein on the inside of the cell membrane.
B) ATP is broken down into ADP and potassium to supply the energy.
C) The carrier protein changes shape as it transports ions from the
intracellular fluid to the extracellular fluid.
D) The ions from inside the cell are transported across the cell membrane.
E) The ions are then released into the extracellular fluid.
2. CORRECT Which of the following statements are not true about the sodium
potassium pump?
A) After releasing ions into the extracellular fluid, the carrier protein exhibits
a new conformation.
B) With this new conformation, the carrier protein can now bind to different
ions in the extracellular fluid.
C) The ions in the extracellular fluid bind to the carrier protein, and the
potassium attached to the carrier protein is released.
D) The carrier protein then changes shape again.
E) The ions from the extracellular fluid are then transported across the cell
membrane to the inside of the cell.
3. CORRECT The sodium potassium exchange pump is an example of...
A) diffusion.
B)facilitated diffusion.
C) active transport.
D) osmosis.
E) filtration.
4. CORRECT The sodium potassium exchange pump moves three potassium ions
out of the cell and two sodium ions into the cell with each cycle.
A) True
B) False
5. CORRECT Active transport moves substances from an area of high concentration
to an area of low concentration of that substance.
A) True
B) False
Sodium Potassium Pump Quiz 3
1. CORRECT The sodium-potassium pump functions to pump
A) sodium ions out of the cell and potassium ions into the cell.
B) sodium ions into the cell and potassium ions out of the cell.
C) sodium and potassium ions into the cell.
D) sodium and potassium ions out of the cell.
E) sodium and potassium ions in both directions across the cell membrane.
2. CORRECT What is the source of energy used to power the sodium-potassium
pump?
A) breakdown of ATP
B) formation of ATP
C) transport of ATP by the pump
D) breakdown of GTP
E) transport of GTP by the pump
3. CORRECT During one cycle, the sodium-potassium pump binds and moves.
A) 1 Na+ and 2 K+.
B) 2 Na+ and 2 K+.
C) 2 Na+ and 3 K+.
D) 3 Na+ and 2 K+.
E) 3 Na+ and 3 K+.
4. CORRECT The sodium-potassium pump is a trans-membrane protein.
A) True
B) False
5. CORRECT The binding and release of sodium or potassium ions are due to
conformational changes in the protein.
A) True
B) False
Chemical Synapse Quiz 1
1. CORRECT An action potential arriving at the presynaptic terminal causes...
A) sodium ions to diffuse into the cell.
B) sodium ions to diffuse out of the cell.
C) calcium ions to diffuse into the cell.
D) acetylcholine to diffuse into the cell.
E) ligand-gated sodium channels to open.
2. CORRECT As a result of question number one...
A) synaptic vessels migrate to the plasma membrane and release
acetylcholine.
B) acetylcholine is actively transported from the pre-synaptic neuron.
C) acetylcholine is actively transported to the post synaptic neuron.
D) ligand-gated sodium channels open.
E) sodium ions diffuse into the cell.
3. CORRECT Acetylcholine has which effect on the post-synaptic neuron?
A) Ligand gated calcium channels open and calcium diffuses in.
B) Ligand gated sodium channels open and sodium diffuses in.
C) Terminal vessels migrate to the plasma membrane.
D) Voltage gated calcium ion channels open and calcium diffuses in.
E) Voltage gated sodium ion channels open and sodium diffuses in.
4. CORRECT If the post-synaptic membrane potential reaches threshold level, an
action potential will be produced.
A) True
B) False
5. CORRECT Acetylcholine is actively transported from the pre-synaptic membrane
to the post - synaptic membrane.
A) True
B) False
Chemical Synapse Quiz 2
1. CORRECT An action potential arriving at the presynaptic terminal causes...
A) voltage-gated sodium ion channels to open, and sodium ions to diffuse
into the cell.
B) voltage-gated sodium ion channels to open, and sodium ions to diffuse
out of the cell.
C) voltage-gated calcium ion channels to open, and calcium ions to diffuse
into the cell.
D) acetylcholine to diffuse into the cell.
E) ligand-gated sodium channels to open, and sodium ions to diffuse out of
the cell.
2. CORRECT As a result of question number one...
A) synaptic vessels migrate to the plasma membrane and release
acetylcholine.
B) acetylcholine is actively transported from the pre-synaptic neuron.
C) acetylcholine is actively transported to the post synaptic neuron.
D) ligand-gated sodium channels open.
E) sodium ions diffuse into the cell.
3. CORRECT Acetylcholine has which effect on the post-synaptic neuron?
A) Ligand gated calcium ion channels open and calcium diffuses in.
B) Ligand gated sodium ion channels open and sodium diffuses in.
C) Terminal vessels migrate to the plasma membrane.
D) Voltage gated calcium ion channels open and calcium diffuses in.
E) Voltage gated sodium ion channels open and sodium diffuses in.
4. CORRECT If the post-synaptic membrane potential reaches threshold level, an
action potential will be produced.
A) True
B) False
5. CORRECT Acetylcholine is actively transported from the pre-synaptic membrane
to the post-synaptic membrane.
A) True
B) False
Nerve Impulse Quiz
1. CORRECT Which of the following statements about the resting membrane
potential is TRUE?
A) the exterior of the cell has a net negative charge and the interior has a net
positive charge
B) the exterior of the cell has a net negative charge and the interior is neutral
C) the exterior of the cell has a net positive charge and the interior has a net
negative charge
D) the exterior of the cell has a net positive charge and the interior is neutral
E) the exterior of the cell is neutral and the interior has a net negative charge
2. CORRECT During depolarization, which of the following statements about voltagegated ion channels is TRUE
A) K+ gates open before Na+ gates
B) Na+ gates open before K+ gates
C) Na+ and K+ gates open at the same time
D) Na+ gates open while K+ gates remain closed
E) K+ gates open while Na+ gates remain closed
3. CORRECT Depolarization occurs because
A) more K+ diffuse into the cell than Na+ diffuse out of
B) more K+ diffuse out of the cell than Na+ diffuse into it
C) more Na+ diffuse into the cell than K+ diffuse out of it
D) more Na+ diffuse out of the cell than K+ diffuse into it
E) both Na+ and K+ diffuse into the cell
4. CORRECT The sodium-potassium pump is involved in establishing the resting
membrane potential.
A) True
B) False
5. CORRECT The nerve impulse is an electrical current that travels along dendrites
or axons.
A) True
B) False
Transmittance across a Synapse
1. CORRECT The primary neurotransmitter at the neuromuscular junction is
A) dopamine.
B) adrenaline.
C) acetylcholine.
D) histamine.
E) serotonin.
2. INCORRECT Arrange the following in the proper order in which they occur at the
pre-synaptic side of a neuromuscular junction.
1. Calcium ions are released
2. Action potential arrives at the presynaptic terminal
3. Neurotransmitter is released
A) 1, 2, 3
B) 2, 1, 3
C) 2, 3, 1
D) 3, 2, 1
E) 3, 1, 2
3. CORRECT Arrange the following in the proper order in which they occur at the
post-synaptic side of a neuromuscular junction.
1. Action potential is propagated over the muscle cell membrane
2. Depolarization of the post-synaptic membrane
3. Sodium ions move into muscle cell
A) 1, 2, 3
B) 2, 1, 3
C) 2, 3, 1
D) 3, 2, 1
E) 3, 1, 2
4. CORRECT The area between the pre-synaptic nerve cell and the post-synaptic
muscle cell is termed the synaptic cleft.
A) True
B) False
5. CORRECT Receptors that bind the neurotransmitter at the post-synaptic cell
membrane are voltage-gated.
A) True
B) False
Voltage Gated Channels and the Action Potential Quiz 1
1. CORRECT The primary neurotransmitter at the neuromuscular junction is
A) dopamine.
B) adrenaline.
C) acetylcholine.
D) histamine.
E) serotonin.
2. INCORRECT Arrange the following in the proper order in which they occur at the
pre-synaptic side of a neuromuscular junction.
1. Calcium ions are released
2. Action potential arrives at the presynaptic terminal
3. Neurotransmitter is released
A) 1, 2, 3
B) 2, 1, 3
C) 2, 3, 1
D) 3, 2, 1
E) 3, 1, 2
3. CORRECT Arrange the following in the proper order in which they occur at the
post-synaptic side of a neuromuscular junction.
1. Action potential is propagated over the muscle cell membrane
2. Depolarization of the post-synaptic membrane
3. Sodium ions move into muscle cell
A) 1, 2, 3
B) 2, 1, 3
C) 2, 3, 1
D) 3, 2, 1
E) 3, 1, 2
4. CORRECT The area between the pre-synaptic nerve cell and the post-synaptic
muscle cell is termed the synaptic cleft.
A) True
B) False
5. CORRECT Receptors that bind the neurotransmitter at the post-synaptic cell
membrane are voltage-gated.
A) True
B) False
Voltage Gated Channels and the Action Potential Quiz 2
1. CORRECT At resting membrane potential, which of the following statements
about the voltage-gated sodium ion (Na+) channels is TRUE?
A) activation gates are closed and inactivation gates are open
B) activation gates are open and inactivation gates are closed
C) activation and inactivation gates are open
D) activation and inactivation gates are closed
E) activation and inactivation gates alternate between open and closed
2. CORRECT During depolarization, which of the following statements about voltagegated ion channels is TRUE?
A) K+ gates open before Na+ gates
B) Na+ gates open before K+ gates
C) Na+ and K+ gates open at the same time
D) Na+ gates open while K+ gates remain closed
E) K+ gates open while Na+ gates remain closed
3.CORRECT Depolarization occurs because
A) more K+ diffuse into the cell than Na+ diffuse out of it.
B) more K+ diffuse out of the cell than Na+ diffuse into it.
C) more Na+ diffuse into the cell than K+ diffuse out of it.
D) more Na+ diffuse out of the cell than K+ diffuse into it.
E) both Na+ and K+ diffuse into the cell.
4. CORRECT The sodium-potassium pump is involved in establishing the resting
membrane potential.
A) True
B) False
5. CORRECT The voltage-gated potassium channels close before the membrane
potential is brought back to its resting level.
A) True
B) False
Action Potential Propagation in an Unmyelinated Axon Quiz 1
1. CORRECT An action potential
A) prevents the neuron cell membrane from altering its charge.
B) causes the inside of the neuron cell membrane to become positive and
the outside negative.
C) causes the inside of the neuron cell membrane to become positive and
the outside neutral.
D) causes the outside of the neuron cell membrane to become positive and
the inside negative.
E) causes the outside of the neuron cell membrane to become positive and
the inside neutral.
2. CORRECT An action potential generates local currents that tend to ________ the
membrane immediately adjacent to the action potential.
A) depolarize
B) repolarize
C) hyperpolarize
D) stabilize
E) neutralize
3. CORRECT The absolute refractory period is the period of time during which
A) a second action potential cannot be generated.
B) a second action potential is generated.
C) the action potential ceases.
D) the action potential decreases in magnitude.
E) the action potential changes direction.
4. CORRECT Action potential propagation occurs in both directions along the axon.
A) True
B) False
5. CORRECT Threshold is the minimum current required for the cell membrane to
generate an action potential.
A) True
B) False
Voltage Gated Channels and the Action Potential Quiz 1
1. CORRECT An action potential...
A) causes the neuron cell membrane to become unable to alter its charge.
B) causes the outside of the neuron cell membrane to become positively
charged in reference to the inside.
C) causes the inside of the neuron cell membrane to become positively
charged in reference to the outside.
D) causes the inside of the neuron cell membrane to become negatively
charged in reference to the outside.
E) causes the inside of the neuron cell membrane to become neutrally
charged in reference to the outside.
2. CORRECT An action potential generates local currents that tend to _____ the
membrane immediately adjacent to the action potential.
A) depolarize
B) repolarize
C) hyperpolarize
D) stabilize
E) neutralize
3. CORRECT Absolute refractory period causes...
A) action potential propagation to cease
B) action potential propagation to begin
C) action potential propagation to increase
D) action potential propagation to occur in both directions
E) action potential propagation to occur in one direction
4. CORRECT Action potentials can travel in both directions on the axon.
A) True
B) False
5. CORRECT Threshold is the minimum current required for the cell membrane to
generate an action potential.
A) True
B) False