3. Selectivity for K ions over other cations in potassium channels is directed b

Question

3. Selectivity for K ions over other cations in potassium channels is directed by: a. The size of the cavity at the entrance to the pore is wide enough to allow ion entrance b. The positioning of negatively charged residues at the entrance of the pore to attract c. The width of the pore in the middle corresponds to the atomic radius of potassium only, d. All of the above without energetically unfavorable dehydration positively charged ions via charge-charge interactions compared with other monovalent cations

Explanation / Answer

A) the size of the cavity at the entrance to the pore is wide enough to allow ion entrance without energetically unfavopurable dehyderation.

B)The poistioning of negatively charged residues at the entrance of the pore aat attract positively charged ions via charge -chrage interactions.

C)The width of pore in the middle corresponds to the atomic radius of potassium only compared with other monovalent cations

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