Multiple Choice
Which statement best describes how the magnitude of a concentration gradient affects the net rate of diffusion across a membrane in passive transport?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Osmosis is best defined as which of the following processes?
A
The movement of water across a membrane from higher solute concentration to lower solute concentration until equilibrium is reached
B
The movement of solute molecules down their concentration gradient across a membrane using a specific carrier protein and ATP
C
The net movement of water across a selectively permeable membrane from lower solute concentration (higher water potential) to higher solute concentration (lower water potential)
D
The net movement of any molecules from a region of higher hydrostatic pressure to lower hydrostatic pressure through a membrane
Verified step by step guidance1
Step 1: Understand the concept of osmosis. Osmosis is the movement of water molecules across a selectively permeable membrane.
Step 2: Identify the direction of water movement in osmosis. Water moves from an area of lower solute concentration (which corresponds to higher water potential) to an area of higher solute concentration (lower water potential).
Step 3: Recognize that osmosis continues until equilibrium is reached, meaning the water potential is balanced on both sides of the membrane.
Step 4: Differentiate osmosis from other processes such as diffusion of solutes or movement driven by hydrostatic pressure, which involve different mechanisms and molecules.
Step 5: Conclude that the best definition of osmosis is the net movement of water across a selectively permeable membrane from lower solute concentration (higher water potential) to higher solute concentration (lower water potential).
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