Question 1
0 out of 1 points
Which of these parameters is not included in the description of permeability (P)?
Selected
Answer:
Partition coefficient
Correct
Answer:
Surface area
Question 2
1 out of 1 points
Which of these statements is not true about neuronal Na+ channels and action potential?
Selected
Answer: In the activated state, at the peak of the action potential, the activation
gate is open, the inactivation gate is closed, and the channel is closed.
Correct
Answer: In the activated state, at the peak of the action potential, the activation
gate is open, the inactivation gate is closed, and the channel is closed.
Question 3
1 out of 1 points
Which of these ions has a higher intracellular to extracellular concentration ration in
humans?
Selected
Answer:
Potassium ion
Correct
Answer:
Potassium ion
Question 4
1 out of 1 points
Solution A contains 100 mmol/L glucose and Solution B contains 50 mmol/L NaCl.
Assume that gNaCl is 2.0, σglucose is 0.5, and σNaCl is 0.8. If a semipermeable
membrane separates the two solutions, what is the direction of water flow across the
membrane?
Selected
Answer: A to
B
Correct
Answer: A to
B
Question 5
1 out of 1 points
Which of these neurotransmitters is majorly inhibitory in its effect on
neurotransmission?
, Selected
Answer:
Glycine
Correct
Answer:
Glycine
Question 6
0 out of 1 points
Which of these statements about driving force is not correct?
Selected
Answer:
For uncharged solutes, the driving force for net diffusion is simply the
concentration difference of the solute across the cell membrane
Correct
Answer:
When the driving force is negative (i.e., RMP is more negative than the
ion's equilibrium potential), that ion X will enter the cell if it is a anion and
will leave the cell if it is an cation.
Question 7
0 out of 1 points
In smooth muscles, at low levels of intracellular Ca 2+ , this protein binds actin and
inhibits myosin ATPase and prevents the interaction of actin and myosin;
Selected
Answer:
Tropomyosin
Correct
Answer:
Calponin
Question 8
1 out of 1 points
Which of these describes the hyperpolarizing afterpotential?
Selected
Answer: The membrane potential is driven even closer to the K +
equilibrium potential
Correct
Answer: It is also called the undershoot
Question 9
1 out of 1 points
The transporter for glucose is specific for d -glucose, but it also recognizes and
transports a closely related sugar, d-galactose.What feature of carrier-mediated
transport does this describe?
Selected
Answer:
Competition
Correct
Answer:
Competition
Question 10
0 out of 1 points
Which of these parameters is not included in the description of permeability (P)?
Selected
Answer:
Partition coefficient
Correct
Answer:
Surface area
Question 2
1 out of 1 points
Which of these statements is not true about neuronal Na+ channels and action potential?
Selected
Answer: In the activated state, at the peak of the action potential, the activation
gate is open, the inactivation gate is closed, and the channel is closed.
Correct
Answer: In the activated state, at the peak of the action potential, the activation
gate is open, the inactivation gate is closed, and the channel is closed.
Question 3
1 out of 1 points
Which of these ions has a higher intracellular to extracellular concentration ration in
humans?
Selected
Answer:
Potassium ion
Correct
Answer:
Potassium ion
Question 4
1 out of 1 points
Solution A contains 100 mmol/L glucose and Solution B contains 50 mmol/L NaCl.
Assume that gNaCl is 2.0, σglucose is 0.5, and σNaCl is 0.8. If a semipermeable
membrane separates the two solutions, what is the direction of water flow across the
membrane?
Selected
Answer: A to
B
Correct
Answer: A to
B
Question 5
1 out of 1 points
Which of these neurotransmitters is majorly inhibitory in its effect on
neurotransmission?
, Selected
Answer:
Glycine
Correct
Answer:
Glycine
Question 6
0 out of 1 points
Which of these statements about driving force is not correct?
Selected
Answer:
For uncharged solutes, the driving force for net diffusion is simply the
concentration difference of the solute across the cell membrane
Correct
Answer:
When the driving force is negative (i.e., RMP is more negative than the
ion's equilibrium potential), that ion X will enter the cell if it is a anion and
will leave the cell if it is an cation.
Question 7
0 out of 1 points
In smooth muscles, at low levels of intracellular Ca 2+ , this protein binds actin and
inhibits myosin ATPase and prevents the interaction of actin and myosin;
Selected
Answer:
Tropomyosin
Correct
Answer:
Calponin
Question 8
1 out of 1 points
Which of these describes the hyperpolarizing afterpotential?
Selected
Answer: The membrane potential is driven even closer to the K +
equilibrium potential
Correct
Answer: It is also called the undershoot
Question 9
1 out of 1 points
The transporter for glucose is specific for d -glucose, but it also recognizes and
transports a closely related sugar, d-galactose.What feature of carrier-mediated
transport does this describe?
Selected
Answer:
Competition
Correct
Answer:
Competition
Question 10
