Multiple Choice
In the context of passive transport (diffusion and osmosis), facilitated diffusion is best described as which of the following?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following statements about osmosis is correct?
A
Osmosis requires ATP to move water molecules against their concentration gradient across a membrane.
B
Osmosis is the net movement of solute molecules across a selectively permeable membrane from higher solute concentration to lower solute concentration.
C
Osmosis is the net movement of water across a selectively permeable membrane from lower solute concentration to higher solute concentration.
D
Osmosis occurs only when the membrane is permeable to solutes but impermeable to water.
Verified step by step guidance1
Step 1: Understand the definition of osmosis. Osmosis is the movement of water molecules across a selectively permeable membrane.
Step 2: Recognize the direction of water movement in osmosis. Water moves from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration).
Step 3: Note that osmosis does not require energy (ATP) because it is a passive process driven by concentration gradients.
Step 4: Identify that osmosis involves water movement, not solute movement, across the membrane.
Step 5: Confirm that the membrane must be selectively permeable to water (allowing water to pass) but not necessarily permeable to solutes for osmosis to occur.
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