Sodium Ions Are Single Atoms

question 21

Multiple Choice

Sodium ions are single atoms.Why can't they simply diffuse through the cell membrane's lipid bilayer?

• A)Since they are charged,ions can't cross the hydrophobic center of the membrane without a channel or pump.
• B)Sodium ions are covalently attached in groups of three,which are too large to diffuse easily.
• C)Ions do traverse the membrane easily,but the sodium-potassium pump moves them back across.
• D)Chelator proteins capture any ions that start to cross the bilayer.

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