AP BIOLOGY

THE CELL

TRANSPORT INTO AND OUT OF THE CELL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Water can pass through the cell membrane by simple diffusion, but it can happen more quickly with the channel proteins called aquaporins. What is the diffusion of water called?
A
simple diffusion
B
osmosis
C
active transport
Explanation: 

Detailed explanation-1: -Aquaporins are a type of membrane protein. These work as water channels in the membrane. They help in transporting water molecules and sometimes solutes across the membranes. This type of transport is known as facilitated diffusion.

Detailed explanation-2: -The transport of water or glycerol through aquaporins represents facilitated diffusion driven by osmotic or concentration gradients.

Detailed explanation-3: -Water can pass through biological membranes via two pathways: simple diffusion through the lipid bilayer, or water-selective facilitated diffusion through aquaporins (AQPs).

Detailed explanation-4: -The type of transport that occurs through aquaporins is a form of passive transport known as osmosis. Osmosis is the movement of water through a semipermeable membrane from high to low concentration.

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