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During osmosis, what is transported across a selectively permeable membrane?
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6. The Membrane
Osmosis
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Osmosis is the movement of:
A
water molecules from a region of low solute concentration to a region of high solute concentration across a selectively permeable membrane
B
ions through a membrane via active transport
C
solute molecules from a region of high concentration to a region of low concentration
D
water molecules from a region of high solute concentration to a region of low solute concentration
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Understand the concept of osmosis: Osmosis is the passive movement of water molecules across a selectively permeable membrane. It occurs without the need for energy input and is driven by differences in solute concentration on either side of the membrane.
Identify the direction of water movement: Water molecules move from a region of low solute concentration (high water potential) to a region of high solute concentration (low water potential) to balance the solute concentrations on both sides of the membrane.
Eliminate incorrect options: Active transport involves energy and is not related to osmosis. Solute molecules moving from high to low concentration describe diffusion, not osmosis. Water moving from high solute concentration to low solute concentration is the opposite of osmosis.
Focus on the correct definition: Osmosis specifically refers to water molecules moving from a region of low solute concentration to a region of high solute concentration across a selectively permeable membrane.
Verify the correct answer: Based on the definition and process of osmosis, the correct answer is 'water molecules from a region of low solute concentration to a region of high solute concentration across a selectively permeable membrane.'
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