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Questions and Answers
What does the Na+/K+-ATPase pump do?
What does the Na+/K+-ATPase pump do?
- Pumps K+ ions in and Na+ ions out
- Pumps Na+ ions in and K+ ions out
- Pumps K+ ions out and Na+ ions in
- Pumps Na+ ions out and K+ ions in (correct)
Which molecule-specific transmembrane protein is usually called 'pumps'?
Which molecule-specific transmembrane protein is usually called 'pumps'?
- Na+/K+-ATPase (correct)
- Na+/glucose cotransporter
- Na+/H+ exchanger
- Glucose transporter
What is the purpose of the Na+/K+-ATPase pump?
What is the purpose of the Na+/K+-ATPase pump?
- To establish steep gradients needed for nerve-muscle impulses
- To keep external Na+ high
- To keep internal Na+ low (correct)
- To maintain the overall charge of the cell
What is the net charge on each side of the membrane as the Na+/K+-ATPase pump operates?
What is the net charge on each side of the membrane as the Na+/K+-ATPase pump operates?
What is the rate at which the Na+/K+-ATPase pump operates?
What is the rate at which the Na+/K+-ATPase pump operates?
How much energy does the Na+/K+-ATPase pump use in most animal cells?
How much energy does the Na+/K+-ATPase pump use in most animal cells?
What does the Na+/glucose cotransporter use to drive the import of glucose?
What does the Na+/glucose cotransporter use to drive the import of glucose?
How many Na+ ions bind to the Na+/glucose cotransporter on the outer apical surface?
How many Na+ ions bind to the Na+/glucose cotransporter on the outer apical surface?
How many moles of Na+ ions need to move into a cell to generate a glucose concentration that is 30,000 times higher inside than outside?
How many moles of Na+ ions need to move into a cell to generate a glucose concentration that is 30,000 times higher inside than outside?
What is the movement of Na+ and glucose across the apical membrane an example of?
What is the movement of Na+ and glucose across the apical membrane an example of?
Which of the following is true about the lipid bilayer?
Which of the following is true about the lipid bilayer?
What determines the rate of simple diffusion across protein-free bilayer membranes?
What determines the rate of simple diffusion across protein-free bilayer membranes?
Which statement about the permeability of membranes to water and small ions is true?
Which statement about the permeability of membranes to water and small ions is true?
What is the main electrical effect of tiny excesses of charges near the plasma membrane?
What is the main electrical effect of tiny excesses of charges near the plasma membrane?
What are the two components of an electrochemical gradient?
What are the two components of an electrochemical gradient?
Which process allows substances to move from a region of high concentration to a region of low concentration?
Which process allows substances to move from a region of high concentration to a region of low concentration?
What is the main driving force for diffusion?
What is the main driving force for diffusion?
What are the two means for movement across a selectively permeable membrane?
What are the two means for movement across a selectively permeable membrane?
What is the characteristic set of carrier proteins for each cell membrane?
What is the characteristic set of carrier proteins for each cell membrane?
What are the two types of transporters and channels involved in facilitated diffusion?
What are the two types of transporters and channels involved in facilitated diffusion?
Which process allows substances to move across membranes by directly passing through the lipid bilayer?
Which process allows substances to move across membranes by directly passing through the lipid bilayer?
Which type of transport uses protein-lined channels to facilitate the movement of substances across membranes?
Which type of transport uses protein-lined channels to facilitate the movement of substances across membranes?
Which type of transport involves membrane-spanning proteins that change shape to facilitate the movement of substances across membranes?
Which type of transport involves membrane-spanning proteins that change shape to facilitate the movement of substances across membranes?
Which type of transport requires energy to move molecules against their concentration gradient?
Which type of transport requires energy to move molecules against their concentration gradient?
Which category of ion channels opens due to a change in voltage difference across the membrane?
Which category of ion channels opens due to a change in voltage difference across the membrane?
Which category of ion channels opens due to the binding of a specific ligand, usually not the transported species?
Which category of ion channels opens due to the binding of a specific ligand, usually not the transported species?
Which category of ion channels opens due to mechanical stimulation, such as pressure or stretch?
Which category of ion channels opens due to mechanical stimulation, such as pressure or stretch?
Which type of transporter allows facilitated diffusion of glucose into muscle cells down its concentration gradient?
Which type of transporter allows facilitated diffusion of glucose into muscle cells down its concentration gradient?
Which transporter is regulated by insulin and is responsible for glucose uptake into various cells?
Which transporter is regulated by insulin and is responsible for glucose uptake into various cells?
Which type of transport uses energy to move molecules against their concentration gradient?
Which type of transport uses energy to move molecules against their concentration gradient?
Diffusion of ions through membrane channels transport is ______ and proceeds down the concentration gradient of the ion being transported
Diffusion of ions through membrane channels transport is ______ and proceeds down the concentration gradient of the ion being transported
Major categories of gated ion channels: 1. Voltage-gated channels -- opens due to change in ______ difference
Major categories of gated ion channels: 1. Voltage-gated channels -- opens due to change in ______ difference
Glucose transporter -- facilitated diffusion of ______ into muscle cell down concentration gradient (High --> Low)
Glucose transporter -- facilitated diffusion of ______ into muscle cell down concentration gradient (High --> Low)
Active transport uses ______ to move molecules 'up' conc. gradient (Low --> High)
Active transport uses ______ to move molecules 'up' conc. gradient (Low --> High)
Na+/K+-ATPase pump changes shape when ________
Na+/K+-ATPase pump changes shape when ________
The Na+/K+-ATPase pump pumps ________ ions out and ________ ions in
The Na+/K+-ATPase pump pumps ________ ions out and ________ ions in
The Na+/glucose cotransporter binds ________ Na+ ions and ________ glucose molecule(s) on the outer apical surface
The Na+/glucose cotransporter binds ________ Na+ ions and ________ glucose molecule(s) on the outer apical surface
Movement of ________ moles of Na+ ions into a cell can generate a glucose concentration that is 30,000 times higher inside than out
Movement of ________ moles of Na+ ions into a cell can generate a glucose concentration that is 30,000 times higher inside than out
Membranes are a billion times more permeable to water than to small ions Fig. 12-2 Inside Outside Approximately equal quantities of +/- charges inside and outside of cell Tiny excesses of + or - charges do occur near PM and have imp. electrical effects Table 12-1 Remember a salty banana Na+______ClK+
Membranes are a billion times more permeable to water than to small ions Fig. 12-2 Inside Outside Approximately equal quantities of +/- charges inside and outside of cell Tiny excesses of + or - charges do occur near PM and have imp. electrical effects Table 12-1 Remember a salty banana Na+______ClK+
Membranes are a billion times more permeable to water than to small ions Fig. 12-2 Inside Outside Approximately equal quantities of +/- charges inside and outside of cell Tiny excesses of + or - charges do occur near PM and have imp. electrical effects Table 12-1 Remember a salty banana Na+Cl______+
Membranes are a billion times more permeable to water than to small ions Fig. 12-2 Inside Outside Approximately equal quantities of +/- charges inside and outside of cell Tiny excesses of + or - charges do occur near PM and have imp. electrical effects Table 12-1 Remember a salty banana Na+Cl______+
Membranes are a billion times more permeable to water than to small ions Fig. 12-2 Inside Outside Approximately equal quantities of +/- charges inside and outside of cell Tiny excesses of + or - charges do occur near PM and have imp. electrical effects Table 12-1 Remember a salty banana ______ClK+
Membranes are a billion times more permeable to water than to small ions Fig. 12-2 Inside Outside Approximately equal quantities of +/- charges inside and outside of cell Tiny excesses of + or - charges do occur near PM and have imp. electrical effects Table 12-1 Remember a salty banana ______ClK+
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