Question

select the true statements. osmosis uses cellular energy. 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.

Explanation:

• Osmosis is a passive process and does not use cellular energy. So the statement "Osmosis uses cellular energy" is false.
• Water molecules can cross the cell membrane by facilitated diffusion through aquaporins.
• In osmosis, water molecules move down their concentration gradient (from an area of higher water concentration to an area of lower water concentration).
• Water molecules can also cross the cell membrane by simple diffusion (though facilitated diffusion through aquaporins is more common in many cells).

Answer:

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