Question

even though water molecules are polar, they are very small, so they can pass through the phospholipid bilayer slowly. water molecules can travel more quickly across the cell membrane through integral proteins called aquaporins. this video shows osmosis. select the true statements. water molecules can cross the cell membrane by facilitated diffusion. water molecules move down their concentration gradient. osmosis uses cellular energy. water molecules can cross the cell membrane by simple diffusion.

Explanation:

Water can cross cell - membranes via aquaporins (facilitated diffusion) and also slowly through the lipid bilayer (simple diffusion). Osmosis is the movement of water down its concentration gradient and it is a passive process, not using cellular energy.

Answer:

• Water molecules can cross the cell membrane by facilitated diffusion.
• Water molecules move down their concentration gradient.
• Water molecules can cross the cell membrane by simple diffusion.