Question

Water moves across the plasma membrane into or out of a cell by osmosis when

A) there is an equal solute concentration on both sides of the membrane.
B) water diffuses through a semipermeable membrane toward a higher solute concentration.
C) water diffuses through a semipermeable membrane toward a lower solute concentration.
D) a high solute concentration opens an aquaporin channel.
E) ATP hydrolysis drives aquaporin transport.

Answer 1

Answer: A) there is an equal solute concentration on both sides of the membrane.

Explanation: This is isotonic. Water is never static, but if the concentration of solute is equal on both sides the water will flow equally both ways.

Answer 2

Osmosis is the diffusion of water across membranes from lower to higher solute concentrations. Water moves from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration) in order to equalize the solute concentrations on both sides of the membrane. Aquaporins facilitate the movement of water during osmosis.

Step-by-step explanation:

Osmosis is the diffusion of water across membranes from lower to higher solute concentrations. Water moves from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration) in order to equalize the solute concentrations on both sides of the membrane. This movement of water is facilitated by aquaporins, which are proteins that serve as channels for water diffusion.