Question

question 2
water can move quickly through the plasma membrane of some cells because...
the bilayer is hydrophilic.
it moves through hydrophobic channels.
water movement is tied to atp hydrolysis.
it is a small, nonpolar molecule.
it moves through aquaporin channel proteins.

Explanation:

• The plasma membrane's bilayer has hydrophobic tails, so the first option is incorrect.
• Hydrophobic channels would not facilitate water (a polar molecule) movement easily, so the second option is wrong.
• Water movement (osmosis in many cases) is often passive and not directly tied to ATP hydrolysis (which is active transport - related), so the third option is incorrect.
• Water is a polar molecule, so the fourth option is wrong.
• Aquaporins are channel proteins that allow rapid water movement across the plasma membrane.

Answer:

it moves through aquaporin channel proteins.