Multiple Choice
Which of the following statements is true of facilitated diffusion across a cell membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following best describes osmosis in cells?
A
The net movement of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration
B
The movement of water through a membrane channel from a region of higher solute concentration to a region of lower solute concentration, requiring ATP
C
The movement of solute molecules across a membrane from a region of lower solute concentration to a region of higher solute concentration using ATP
D
The net movement of any molecules across a membrane from a region of higher solute concentration to a region of lower solute concentration until equilibrium is reached
Verified step by step guidance1
Understand that osmosis specifically refers to the movement of water molecules, not solutes, across a selectively permeable membrane.
Recognize 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 levels on both sides.
Note that osmosis does not require energy (ATP) because it is a passive process driven by concentration gradients.
Distinguish osmosis from other types of transport such as active transport (which requires ATP) and diffusion of solutes.
Conclude that the best description of osmosis is the net movement 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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