Answer :

Cell membranes are permeable to water but not to sugar. Water can freely pass through the membrane, whereas sugar requires transport proteins to move across. This selective permeability ensures proper cellular function.

Cell membranes are selectively permeable, allowing some molecules to pass while blocking others. In this context, the membrane is permeable to water but impermeable to sugar. Water molecules are small enough to freely move across the membrane through osmosis, whereas sugar molecules, being larger and more complex, require transport proteins to cross the membrane.

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