CBNS 120 3-4 QUESTIONS WITH VERIFIED ANSWERS
ATPases (pumps) like the Na/K Pump transfer ions across the membrane at rates of -
Answers - 10^0-10^3
In voltage-gated channels, the S4 transmembrane segment functions as a and the loop
between S5 and S6 functions as the . - Answers - Voltage Sensor; Pore
Ligands that activate channels from the cytoplasmic side of the membrane include -
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 - A & B only (Membrane Spanning
& Transmembrane Segments)
Neuronal nicotinic receptors can be formed from: - Answers - A & C only (alpha and
beta segments & alpha only)
Nicotinic receptor subunits have which number of transmembrane segments? - Answers
-4
The following are specific blockers of the Na/K Pump: (Choose all that are correct) -
Answers - ouabain & digoxin
The transporter that sequesters Ca in the endoplasmic reticulum is: - Answers - The
SERCA pump
The alpha subunit of voltage-gated Na channels has how many transmembrane
segments? - Answers - 24
Injection of Na ions into a neuron would: (check all possible answers) - Answers -
Hyperpolarize the membrane potential & Activate the Na/K pump
A complete cycle of the Na/K ATPase requires: - Answers - all of the above (Na binding,
K binding, Phosphorylation, Dephosphorlation)
Match the questions and answers
1. Na/K ATPase
2. Na/Ca Exchanger (NCX)
3. SERCA pump
4. NaKCC1 - Answers - 1. Electrogenic
2. Driven by NA Gradient
3. Ca ATPase
4. Sympoter
ATPases (pumps) like the Na/K Pump transfer ions across the membrane at rates of -
Answers - 10^0-10^3
In voltage-gated channels, the S4 transmembrane segment functions as a and the loop
between S5 and S6 functions as the . - Answers - Voltage Sensor; Pore
Ligands that activate channels from the cytoplasmic side of the membrane include -
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 - A & B only (Membrane Spanning
& Transmembrane Segments)
Neuronal nicotinic receptors can be formed from: - Answers - A & C only (alpha and
beta segments & alpha only)
Nicotinic receptor subunits have which number of transmembrane segments? - Answers
-4
The following are specific blockers of the Na/K Pump: (Choose all that are correct) -
Answers - ouabain & digoxin
The transporter that sequesters Ca in the endoplasmic reticulum is: - Answers - The
SERCA pump
The alpha subunit of voltage-gated Na channels has how many transmembrane
segments? - Answers - 24
Injection of Na ions into a neuron would: (check all possible answers) - Answers -
Hyperpolarize the membrane potential & Activate the Na/K pump
A complete cycle of the Na/K ATPase requires: - Answers - all of the above (Na binding,
K binding, Phosphorylation, Dephosphorlation)
Match the questions and answers
1. Na/K ATPase
2. Na/Ca Exchanger (NCX)
3. SERCA pump
4. NaKCC1 - Answers - 1. Electrogenic
2. Driven by NA Gradient
3. Ca ATPase
4. Sympoter
