CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1 · Question Q12
\text{Na}^+ and \text{K}^+ cannot pass freely into a cell across the phospholipid bilayer because
- (A)they are repelled by the charged cytoplasm
- (B)they are too large to pass
- (C)of the hydrophobic nature of the layer
- (D)they are moving against a concentration gradient
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