The selectivity of ion pumps in pumping ions across the cell membrane is based on differences in ionic radius.

Name: The selectivity of ion pumps in pumping ions across the cell membrane is based on differences in ionic radius.
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The selectivity of ion pumps is based on differences in ionic radius. Larger ions are less likely to be pumped across the membrane compared to smaller ions, hence selective pumping takes place.

The Selectivity of Ion Pumps in Pumping Ions Across the Cell