Multiple Choice
Which of the following is an example of passive transport across a cell membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following statements about osmosis is false?
A
In osmosis, water moves until equilibrium is reached, at which point there is no net movement of water across the membrane.
B
Osmosis is the diffusion of solute molecules across a selectively permeable membrane from high solute concentration to low solute concentration.
C
Osmosis is the net movement of water across a selectively permeable membrane from a region of higher water potential (lower solute concentration) to lower water potential (higher solute concentration).
D
Osmosis requires a selectively permeable membrane that is permeable to water but not to at least one solute.
Verified step by step guidance1
Step 1: Understand the definition of osmosis. Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration (higher water potential) to an area of higher solute concentration (lower water potential).
Step 2: Identify the key components of osmosis: it involves water, a selectively permeable membrane, and a concentration gradient of solutes that affects water potential.
Step 3: Analyze each statement to see if it correctly describes osmosis. For example, check if the statement correctly identifies what moves (water, not solute) and the direction of movement (toward higher solute concentration).
Step 4: Recognize that the false statement is the one that incorrectly describes osmosis as the diffusion of solute molecules rather than water molecules.
Step 5: Confirm that the other statements correctly describe osmosis, including the requirement of a selectively permeable membrane and the movement of water until equilibrium is reached with no net movement.
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