Podcast
Questions and Answers
Ion channels facilitate what kind of movement of ions across membranes and what kind of pathway for ions to move through the lipid core of the membrane?
Ion channels facilitate what kind of movement of ions across membranes and what kind of pathway for ions to move through the lipid core of the membrane?
- passive and polar (correct)
- passive and nonpolar
- active and polar
- active and nonpolar
What is a pore?
What is a pore?
- provides nonpolar pathway for movement of ions
- provides polar a polar pathway for movement of ions (correct)
- provides no pathway for movement of ions
- only present in lipid molecules
What is a gate?
What is a gate?
- regulates only the calcium gradient
- regulates active transport through the cell
- regulates the size of the cell
- regulates the movement of ions through the pore (correct)
What is permeation?
What is permeation?
What is gating?
What is gating?
Channel Gating....
Channel Gating....
Which of the following best describes a reversible process in ion channels?
Which of the following best describes a reversible process in ion channels?
What determines whether an ion channel is open or closed at any given time?
What determines whether an ion channel is open or closed at any given time?
How do membrane stimuli affect the probability of ion channel opening or closing?
How do membrane stimuli affect the probability of ion channel opening or closing?
Which type of ions move with the field in a membrane?
Which type of ions move with the field in a membrane?
What is the unit of measurement for current?
What is the unit of measurement for current?
What happens to the cell interior during hyperpolarization?
What happens to the cell interior during hyperpolarization?
Which of the following best describes the rate of a First order process in ion channels?
Which of the following best describes the rate of a First order process in ion channels?
What is the average dwell time in the open state of an ion channel?
What is the average dwell time in the open state of an ion channel?
What is the effect of ligand binding on ion channel opening probability?
What is the effect of ligand binding on ion channel opening probability?
Which ion is higher inside the cell than outside, making it easier to send more of this ion inside the cell?
Which ion is higher inside the cell than outside, making it easier to send more of this ion inside the cell?
What is the driving force for ion currents in the cell membrane?
What is the driving force for ion currents in the cell membrane?
What is the term used to describe the large change in inward current for a small change in voltage, and very little change in outward current for a change in voltage?
What is the term used to describe the large change in inward current for a small change in voltage, and very little change in outward current for a change in voltage?
Which ion is higher inside the cell than outside, making it easier to send more of this ion inside the cell?
Which ion is higher inside the cell than outside, making it easier to send more of this ion inside the cell?
What is the driving force for ion currents in the cell membrane?
What is the driving force for ion currents in the cell membrane?
What is the term used to describe the large change in outward current for a small change in voltage, and very little change in inward current for a change in voltage?
What is the term used to describe the large change in outward current for a small change in voltage, and very little change in inward current for a change in voltage?
What is the unit of measurement for current?
What is the unit of measurement for current?
What is the effect of hyperpolarization on the cell membrane?
What is the effect of hyperpolarization on the cell membrane?
