Membrane ion channels A. Consist mainly of carbohydrate and lipid. B

1.	Membrane ion channels A. Consist mainly of carbohydrate and lipid. B. Have a specific structure for each ion species. C. For sodium may be blocked by tetrodotoxin. D. May be opened by a given change in transmembrane potential.E. Remain open as long as the activating signal is present.
Answer» A. False They are usually proteins. B. False There is usually a family of channels for each ion species. C. True This toxin from the puffer fish specifically blocks sodium channels. D. True These channels are ‘voltage-gated’ channels; ‘ligand-gated’ channels are opened by chemical substances such as acetylcholine. E. False They close automatically after a certain interval.

Membrane ion channels A. Consist mainly of carbohydrate and lipid. B. Have a specific structure for each ion species. C. For sodium may be blocked by tetrodotoxin. D. May be opened by a given change in transmembrane potential.E. Remain open as long as the activating signal is present.

Answer»

A. False They are usually proteins.

B. False There is usually a family of channels for each ion species.

C. True This toxin from the puffer fish specifically blocks sodium channels.

D. True These channels are ‘voltage-gated’ channels; ‘ligand-gated’ channels are opened by chemical substances such as acetylcholine.

E. False They close automatically after a certain interval.

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Membrane ion channels A. Consist mainly of carbohydrate and lipid. B. Have a specific structure for each ion species. C. For sodium may be blocked by tetrodotoxin. D. May be opened by a given change in transmembrane potential.E. Remain open as long as the activating signal is present.

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