Multiple Choice
In the context of passive transport, simple diffusion across a plasma membrane requires __________.
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In cell biology, osmosis refers to the movement of which substance across a selectively permeable membrane?
A
Ions moving against their concentration gradient using ATP-driven pumps
B
Water molecules moving from higher solute concentration to lower solute concentration
C
Solute molecules moving from higher solute concentration to lower solute concentration
D
Water molecules moving from lower solute concentration to higher solute concentration
Verified step by step guidance1
Understand the definition of osmosis: Osmosis is the passive movement of water molecules across a selectively permeable membrane.
Recall that water moves from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration) to balance solute concentrations on both sides.
Recognize that osmosis does not involve the movement of solutes or ions, and it does not require energy (ATP).
Identify that the correct direction of water movement in osmosis is from lower solute concentration to higher solute concentration, not the reverse.
Conclude that the correct description of osmosis is 'Water molecules moving from lower solute concentration to higher solute concentration.'
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