Question

watch the video again. it shows the movement of water molecules across the cell membrane during osmosis. osmosis occurs without using energy from the cell. complete the paragraph. osmosis is the transport of water molecules their concentration gradient. during osmosis, water molecules can move via diffusion through channel proteins or via diffusion through phospholipids.

Explanation:

To solve this, we recall concepts of osmosis:

1. Osmosis is passive transport (no energy used), so first blank: passive.
2. Water moves down its concentration gradient (from high to low concentration), so second blank: down.
3. Movement through channel proteins is facilitated diffusion, so third blank: facilitated.
4. Movement through phospholipids (lipid bilayer) is simple diffusion, so fourth blank: simple.

Answer:

1. passive
2. down
3. facilitated
4. simple