Sodium and potassium ion channels have several negatively charged residues at the entry to the channel. on what basis do k+ channels specifically select for k+ ions? (in other words, why dont k+ channels enable na+ ions to cross the membrane? )
a. ionic radius, na+ is to smallb. energy cost, it is to energetically costly to dehydrate na+c. charge, na is slightly more electronegative than k and does not interact with the channel carbonyl groupsd. charge, na is slightly less electronegative than k and does not interact with the channel carbonyl groupse. ionic radius, na+ is too big
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Sodium and potassium ion channels have several negatively charged residues at the entry to the chann...
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