Multiple Choice
In the context of passive transport, what process allows water to move across a selectively permeable cell membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, which statement best defines osmosis?
A
The bulk movement of fluid and dissolved materials driven by pressure differences through a tissue or vessel
B
The movement of solute molecules across a membrane from a region of lower solute concentration to a region of higher solute concentration without energy input
C
The diffusion of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration
D
The transport of ions across a membrane using ATP to move them against their concentration gradients
Verified step by step guidance1
Step 1: Understand the concept of passive transport, which involves the movement of molecules across a membrane without the use of cellular energy (ATP).
Step 2: Recognize that osmosis is a specific type of passive transport that involves the movement of water molecules, not solutes or ions.
Step 3: Recall that osmosis occurs across a selectively permeable membrane, which allows water to pass but restricts certain solutes.
Step 4: Identify the direction of water movement in osmosis: water moves from a region of lower solute concentration (higher water concentration) to a region of higher solute concentration (lower water concentration).
Step 5: Conclude that the best definition of osmosis is the diffusion of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
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