Multiple choice

Facilitated diffusion involves

  1. movement of solute into the solvent with the utilisation of energy

  2. movement of solute into the solvent without the utilisation of energy

  3. movement of solute into the solvent without the help of carrier molecules

  4. movement of solute into the solvent with the help of carrier molecules
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Facilitated diffusion uses carrier proteins or channel proteins to move solutes across membranes down their concentration gradient without energy expenditure. The carrier proteins provide selective pathways for specific molecules that cannot pass through the lipid bilayer.

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