Multiple Choice
In the context of passive transport, osmosis is defined as the movement of which substance across a selectively permeable membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, which option best defines osmosis?
A
Net movement of solute molecules down their concentration gradient through a selectively permeable membrane, with water moving in the opposite direction
B
Net movement of solute molecules from a region of higher solute concentration to a region of lower solute concentration across any membrane, requiring ATP
C
Net movement of water across a selectively permeable membrane from a region of lower solute concentration (higher water potential) to a region of higher solute concentration (lower water potential), without energy input
D
Movement of water and solutes together through a membrane protein channel from low concentration to high concentration, requiring ATP
Verified step by step guidance1
Understand that osmosis is a specific type of passive transport involving water molecules, not solutes.
Recall that osmosis occurs across a selectively permeable membrane, which allows water to pass but restricts many solutes.
Recognize that water moves from an area of lower solute concentration (which corresponds to higher water potential) to an area of higher solute concentration (lower water potential).
Note that osmosis does not require energy input (ATP) because it is a passive process driven by concentration gradients.
Summarize that the best definition of osmosis is the net movement of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration without energy input.
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