Multiple Choice
In the context of passive transport, osmosis is the movement of which molecule across a selectively permeable membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
During osmosis across a selectively permeable membrane, which statement best describes what happens?
A
Water is pumped across the membrane using ATP to move against its concentration gradient.
B
Water moves from the side with lower solute concentration (higher water potential) to the side with higher solute concentration (lower water potential).
C
Water moves from the side with higher solute concentration (lower water potential) to the side with lower solute concentration (higher water potential).
D
Solute molecules move from the side with higher solute concentration to the side with lower solute concentration until equilibrium is reached.
Verified step by step guidance1
Understand that osmosis is the passive movement of water molecules across a selectively permeable membrane, meaning it does not require energy (ATP).
Recall that water moves from an area of higher water potential (which corresponds to lower solute concentration) to an area of lower water potential (which corresponds to higher solute concentration).
Recognize that water potential is influenced by solute concentration: more solute means lower water potential, and less solute means higher water potential.
Note that during osmosis, solute molecules generally do not move across the membrane; instead, water moves to balance solute concentrations on both sides.
Conclude that the correct description is: water moves from the side with lower solute concentration (higher water potential) to the side with higher solute concentration (lower water potential).
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