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Ligand-Gated Channels
Grade Level
AP Biology
APB.218 Ligand-Gated Channels
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A ligand-gated Na+ channel opens only after ligand binding and closes when the ligand is hydrolyzed by an enzyme in the synaptic cleft. Which prediction is best if the enzyme is inhibited?
A
Na+ influx will stop faster because ligand cannot bind without the enzyme.
B
Na+ influx may last longer because ligand remains available to keep channels open.
C
Na+ efflux will increase because ligand hydrolysis powers outward movement.
D
Na+ movement will become independent of channel opening.
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