Multiple choice

Which of the following substances would cross the cell membrane using facilitated diffusion?

  1. sugar molecule

  2. water

  3. sodium ions

  4. calcium ions
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A Correct answer
Explanation

Sugar molecules (like glucose) are large and polar, requiring transport proteins to cross the membrane via facilitated diffusion. Water uses aquaporins (often considered separate from facilitated diffusion in some contexts), and ions typically use channels.

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