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Ion Channels and Membrane Polarization
Grade Level
AP Biology
APB.143 Ion Channels and Membrane Polarization
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A K+ channel's selectivity filter prevents Na+ from passing even though Na+ is smaller. Why does this matter for predicting polarization?
A
The filter causes Na+ and K+ to exchange charges before crossing the membrane.
B
The voltage effect depends on K+ movement specifically, not on all nearby cations moving through the pore.
C
The filter means no charged ions can cross, so polarization never changes.
D
The filter makes Na+ cross the phospholipid bilayer faster than through a channel.
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