CBNS 120 QUESTIONS WITH VERIFIED ANSWERS
Cajal used the _____ stain to prove the _____ Doctrine. - Answers - Golgi; Neuron
Conductance is the reciprocal of: - Answers - resistance
Hyperpolarization occurs when the membrane potential becomes more _____ , while
depolarization causes the membrane potential to become more _____ . - Answers -
negative; positive
Permeability indicates the presence of _____ . - Answers - open channels
Permeability indicates the presence of _____ , while conductance requires _____ and
_____ . - Answers - open channels; ions; permeability
Categories of ion channels include those activated by _____ , _____ , and _____ . -
Answers - ligands; voltage, stretch
Conductance can be distinguished from permeability by the requirement for _____ . -
Answers - charge carriers
The membrane potential at which the diffusional force created by an ion gradient is
equal and opposite to the electrical force is called the _____ . - Answers - equilibrium
potential
The difference between the membrane potential (Vm) and the equilibrium potential (Ex)
for any given ion is called _____ . - Answers - driving force
When the magnitude of current flow across the membrane in one direction exceeds
current flow in the opposite direction, it is called _____ . - Answers - rectification
Ion channels flux (transfer) ions across the membrane at rates of _____ , _____ , _____
- Answers - 10^7-10^8 ions/sec
In the figure depicted below, current is plotted as a function of voltage. Two linear I-V
relationships are shown. The lines are parallel. The slope of line A is defined as -
Answers - conductance
In the figure depicted below, current is plotted as a function of voltage. Two linear I-V
relationships are shown. The lines are parallel. The slope of line A is defined as
, In the previous question, the conductance of A is _____ the conductance of B. -
Answers - equal to
In the figure depicted below, current is plotted as a function of voltage. Two linear I-V
relationships are shown. The lines are parallel. The slope of line A is defined as
In Question 12, the equilibrium potential of I-V relationship A is _____ mV and the
equilibrium potential for B is _____ mV. - Answers - -75; -50
In the figure depicted below, the conductance of A is _____ the conductance of B. -
Answers - greater than
Driving Force is: - Answers - equals the difference between the equilibrium potential
(Ex) and the membrane potential (Vm).
zero when the Vm = Ex
is required for current to flow across the membrane
Ion channel activity is: - Answers - Random
Stochastic
Probablistic
The graph below displays: - Answers - Outward rectification
More current flow in the outward direction
ATPases like the Na/K Pump transfer ions across the membrane at rates of - Answers -
10^0-10^3 ions/sec
In voltage-gated channels, the S4 transmembrane segment functions as a _____ and
the loop between S5 and S6 functions as the _____ . - Answers - voltage sensor; P
region
Ligands that activate channels from the cytoplasmic side of the membrane include
_____ and _____ . - Answers - cyclic GMP; calcium
Regions of channel proteins that cross the membrane from one side (e.g., extracellular)
to the other (e.g., cytoplasmic) are called: - Answers - membrane-spanning segments;
transmembrane segments
Neuronal nicotinic receptors can be formed from: - Answers - α and β subunits; α
subunits only
Cajal used the _____ stain to prove the _____ Doctrine. - Answers - Golgi; Neuron
Conductance is the reciprocal of: - Answers - resistance
Hyperpolarization occurs when the membrane potential becomes more _____ , while
depolarization causes the membrane potential to become more _____ . - Answers -
negative; positive
Permeability indicates the presence of _____ . - Answers - open channels
Permeability indicates the presence of _____ , while conductance requires _____ and
_____ . - Answers - open channels; ions; permeability
Categories of ion channels include those activated by _____ , _____ , and _____ . -
Answers - ligands; voltage, stretch
Conductance can be distinguished from permeability by the requirement for _____ . -
Answers - charge carriers
The membrane potential at which the diffusional force created by an ion gradient is
equal and opposite to the electrical force is called the _____ . - Answers - equilibrium
potential
The difference between the membrane potential (Vm) and the equilibrium potential (Ex)
for any given ion is called _____ . - Answers - driving force
When the magnitude of current flow across the membrane in one direction exceeds
current flow in the opposite direction, it is called _____ . - Answers - rectification
Ion channels flux (transfer) ions across the membrane at rates of _____ , _____ , _____
- Answers - 10^7-10^8 ions/sec
In the figure depicted below, current is plotted as a function of voltage. Two linear I-V
relationships are shown. The lines are parallel. The slope of line A is defined as -
Answers - conductance
In the figure depicted below, current is plotted as a function of voltage. Two linear I-V
relationships are shown. The lines are parallel. The slope of line A is defined as
, In the previous question, the conductance of A is _____ the conductance of B. -
Answers - equal to
In the figure depicted below, current is plotted as a function of voltage. Two linear I-V
relationships are shown. The lines are parallel. The slope of line A is defined as
In Question 12, the equilibrium potential of I-V relationship A is _____ mV and the
equilibrium potential for B is _____ mV. - Answers - -75; -50
In the figure depicted below, the conductance of A is _____ the conductance of B. -
Answers - greater than
Driving Force is: - Answers - equals the difference between the equilibrium potential
(Ex) and the membrane potential (Vm).
zero when the Vm = Ex
is required for current to flow across the membrane
Ion channel activity is: - Answers - Random
Stochastic
Probablistic
The graph below displays: - Answers - Outward rectification
More current flow in the outward direction
ATPases like the Na/K Pump transfer ions across the membrane at rates of - Answers -
10^0-10^3 ions/sec
In voltage-gated channels, the S4 transmembrane segment functions as a _____ and
the loop between S5 and S6 functions as the _____ . - Answers - voltage sensor; P
region
Ligands that activate channels from the cytoplasmic side of the membrane include
_____ and _____ . - Answers - cyclic GMP; calcium
Regions of channel proteins that cross the membrane from one side (e.g., extracellular)
to the other (e.g., cytoplasmic) are called: - Answers - membrane-spanning segments;
transmembrane segments
Neuronal nicotinic receptors can be formed from: - Answers - α and β subunits; α
subunits only
