Question

movement of water molecules across membranes by osmosis and the role of aquaporins (b2.1.5) discuss the role of aquaporins in the movement of water

Explanation:

Aquaporins are membrane - bound proteins. They form channels that facilitate the rapid movement of water molecules across cell membranes by osmosis, increasing the rate of water transport compared to simple diffusion. They are selective for water and help maintain cell water balance and osmotic equilibrium.

Answer:

Aquaporins are integral membrane proteins that form channels, allowing water molecules to move across cell membranes more efficiently by osmosis, which helps in maintaining cell water and osmotic balance.