BMS 300 EXAM 2 QUESTIONS WITH VERIFIED
ACCURATE ANSWERS
Reticularists - Answers - camillo golgi
Cellularists - Answers - Santiago Roman y Cajal
input - Answers - dendrite
conductile - Answers - axon
output - Answers - axon terminal
Protein synthesis occurs in the
a. cell body
b. axon
c. dendrite
d. terminal - Answers - a. cell body
The input region lacks _________________, but contains _____________________.
a. Ligand-gated channels, voltage gated channels
b. K+ leak channels, voltage gated channels
c. Voltage-gated channels, ligand gated channels
d. Ligand-gated channels, K+ leak channels - Answers - c. Voltage-gated channels,
ligand gated channels
The fast axoplasmic transport includes proteins from the __________ and transported
on ___________. The slow axoplasmic transport includes proteins from the
____________.
a. RER, microtubules, cytoplasm
b. microtubules, cytoplasm, RER
c. cytoplasm, RER, microtubules - Answers - a. RER, microtubules, cytoplasm
Proteins are transported via axoplasmic transport at slow rates (0.5 to 2 mm per day)
and fast rates (200 to 400 mm per day). The difference in transport rate directly results
from:
a. the difference in the time spent per day in transport by kinesin on microtubules
b. the site where the protein is synthesized
c. the substrate molecule used by the motor protein
d. the motor protein used to transport the proteins - Answers - a. the difference in the
time spent per day in transport by kinesin on microtubules
,_____________ ____________ are located in the peripheral nervous system (PNS)
and _______________________ are found in the central nervous system (CNS). -
Answers - Schwann cells; oligodendrocytes
Astrocytes - Answers - - regulate extracellular K+ concentrations
- clear out excess amounts of neurotransmitters
- surround the synaptic cleft between neurons
The concentric rings formed by oligodendrocytes are called:
a. Schwann cells
b. Astrocytes
c. Myelin - Answers - c. Myelin
What channels are located exclusively at the Nodes of Ranvier? - Answers - VG K+ and
Na+ channels
To clear neurotransmitter from the synaptic cleft in the central nervous system, there
are cells that contain transmembrane proteins that simultaneously bind Na + and the
neurotransmitter glutamate. This transmembrane protein then simultaneously transports
them into the cell's cytoplasm. The cell type where you would expect to find such
transporters would be the:
a. Astrocyte
b. Oligodendrocyte
c. Schwann
d. Neuron - Answers - a. Astrocyte
What two ions are responsible for establishing an equilibrium between the electrical and
chemical gradients? - Answers - Potassium (K+) and Anions
The Nernst potential equation depends on: - Answers - - Charge on ions
- Concentration of ions outside the cell
- Concentration of ions inside the cell
- Temperature
The membrane potential seeks the equilibrium potential of the ion whose permeability is
dominant.
a. True
b. False - Answers - a. True
When gated Na+ channels close, what ion is responsible for bringing the membrane
back to resting membrane potential?
a. Chloride (Cl-)
b. Sodium (Na+)
c. Potassium (K+)
d. Anions - Answers - c. Potassium (K+)
, What channel is responsible for setting the resting membrane potential?
a. Voltage-gated K+ channel
b. Voltage-gated Na+ channel
c. Voltage-gated Cl- channel
d. K+ leak channel - Answers - d. K+ leak channel
During depolarization, the dominant channel that is open is the
______________________ . During repolarization, the dominant channel that is open is
the _______________________. - Answers - Voltage gated Na+ channels; Voltage
gated K+ channels
When measurements are taken along an unmyelinated axon where the voltage gated
channels are clustered at one site, we see a decrease in voltage as we move down the
axon. Why do we see this decrease?
a. Charge leaves through V-gated Na+ channels
b. Charge leaves through K+ leak channels
c. Charge enters through V-gated K+ channels
d. Charge enters through K+ leak channels
e. Charge leaves through V-gated K+ channels - Answers - b. Charge leaves through
K+ leak channels
There is a type of toxin found in the liver of the puffer fish that prevents the opening of
voltage-gated Na+ channels in neurons. The effect of this toxin is to:
a. prevents the initiation of the action potential
b. depolarizes the membrane potential and maintains it depolarized
c. prolongs the return of the membrane potential to the resting level
d. increases the duration of the action potential
e. All answers are correct - Answers - a. prevents the initiation of the action potential
Myelin reduces membrane capacitance by increasing the thickness of the membrane
and thus increasing the separation of cations and anions.
a. True
b. False - Answers - a. True
internodal region - Answers - lacks voltage gated Na+ and K+ channels
capacitor - Answers - storage of charge across a non-conducting medium
unmyelinated axons - Answers - action potentials propagate at 1 m/s (slow)
K+ leak channels - Answers - always open
Voltage-gated Na+ channels are....
a. Opened by the presence of negative charge
b. Opened by the presence of positive charge
c. Always open
ACCURATE ANSWERS
Reticularists - Answers - camillo golgi
Cellularists - Answers - Santiago Roman y Cajal
input - Answers - dendrite
conductile - Answers - axon
output - Answers - axon terminal
Protein synthesis occurs in the
a. cell body
b. axon
c. dendrite
d. terminal - Answers - a. cell body
The input region lacks _________________, but contains _____________________.
a. Ligand-gated channels, voltage gated channels
b. K+ leak channels, voltage gated channels
c. Voltage-gated channels, ligand gated channels
d. Ligand-gated channels, K+ leak channels - Answers - c. Voltage-gated channels,
ligand gated channels
The fast axoplasmic transport includes proteins from the __________ and transported
on ___________. The slow axoplasmic transport includes proteins from the
____________.
a. RER, microtubules, cytoplasm
b. microtubules, cytoplasm, RER
c. cytoplasm, RER, microtubules - Answers - a. RER, microtubules, cytoplasm
Proteins are transported via axoplasmic transport at slow rates (0.5 to 2 mm per day)
and fast rates (200 to 400 mm per day). The difference in transport rate directly results
from:
a. the difference in the time spent per day in transport by kinesin on microtubules
b. the site where the protein is synthesized
c. the substrate molecule used by the motor protein
d. the motor protein used to transport the proteins - Answers - a. the difference in the
time spent per day in transport by kinesin on microtubules
,_____________ ____________ are located in the peripheral nervous system (PNS)
and _______________________ are found in the central nervous system (CNS). -
Answers - Schwann cells; oligodendrocytes
Astrocytes - Answers - - regulate extracellular K+ concentrations
- clear out excess amounts of neurotransmitters
- surround the synaptic cleft between neurons
The concentric rings formed by oligodendrocytes are called:
a. Schwann cells
b. Astrocytes
c. Myelin - Answers - c. Myelin
What channels are located exclusively at the Nodes of Ranvier? - Answers - VG K+ and
Na+ channels
To clear neurotransmitter from the synaptic cleft in the central nervous system, there
are cells that contain transmembrane proteins that simultaneously bind Na + and the
neurotransmitter glutamate. This transmembrane protein then simultaneously transports
them into the cell's cytoplasm. The cell type where you would expect to find such
transporters would be the:
a. Astrocyte
b. Oligodendrocyte
c. Schwann
d. Neuron - Answers - a. Astrocyte
What two ions are responsible for establishing an equilibrium between the electrical and
chemical gradients? - Answers - Potassium (K+) and Anions
The Nernst potential equation depends on: - Answers - - Charge on ions
- Concentration of ions outside the cell
- Concentration of ions inside the cell
- Temperature
The membrane potential seeks the equilibrium potential of the ion whose permeability is
dominant.
a. True
b. False - Answers - a. True
When gated Na+ channels close, what ion is responsible for bringing the membrane
back to resting membrane potential?
a. Chloride (Cl-)
b. Sodium (Na+)
c. Potassium (K+)
d. Anions - Answers - c. Potassium (K+)
, What channel is responsible for setting the resting membrane potential?
a. Voltage-gated K+ channel
b. Voltage-gated Na+ channel
c. Voltage-gated Cl- channel
d. K+ leak channel - Answers - d. K+ leak channel
During depolarization, the dominant channel that is open is the
______________________ . During repolarization, the dominant channel that is open is
the _______________________. - Answers - Voltage gated Na+ channels; Voltage
gated K+ channels
When measurements are taken along an unmyelinated axon where the voltage gated
channels are clustered at one site, we see a decrease in voltage as we move down the
axon. Why do we see this decrease?
a. Charge leaves through V-gated Na+ channels
b. Charge leaves through K+ leak channels
c. Charge enters through V-gated K+ channels
d. Charge enters through K+ leak channels
e. Charge leaves through V-gated K+ channels - Answers - b. Charge leaves through
K+ leak channels
There is a type of toxin found in the liver of the puffer fish that prevents the opening of
voltage-gated Na+ channels in neurons. The effect of this toxin is to:
a. prevents the initiation of the action potential
b. depolarizes the membrane potential and maintains it depolarized
c. prolongs the return of the membrane potential to the resting level
d. increases the duration of the action potential
e. All answers are correct - Answers - a. prevents the initiation of the action potential
Myelin reduces membrane capacitance by increasing the thickness of the membrane
and thus increasing the separation of cations and anions.
a. True
b. False - Answers - a. True
internodal region - Answers - lacks voltage gated Na+ and K+ channels
capacitor - Answers - storage of charge across a non-conducting medium
unmyelinated axons - Answers - action potentials propagate at 1 m/s (slow)
K+ leak channels - Answers - always open
Voltage-gated Na+ channels are....
a. Opened by the presence of negative charge
b. Opened by the presence of positive charge
c. Always open
