Multiple Choice
In the context of passive transport across the plasma membrane, how do simple diffusion and facilitated diffusion differ?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In osmosis across a selectively permeable membrane, the net movement of water is always from a region with which condition to a region with the opposite condition?
A
Lower osmotic pressure to higher osmotic pressure
B
Higher water potential (lower solute concentration) to lower water potential (higher solute concentration)
C
Higher solute concentration to lower solute concentration
D
Lower water potential (higher solute concentration) to higher water potential (lower solute concentration)
Verified step by step guidance1
Understand that osmosis is the movement of water across a selectively permeable membrane from a region of higher water potential to a region of lower water potential.
Recall that water potential is influenced by solute concentration: higher solute concentration lowers water potential, while lower solute concentration raises water potential.
Recognize that water moves from areas of lower solute concentration (higher water potential) to areas of higher solute concentration (lower water potential) to balance solute levels on both sides of the membrane.
Note that osmotic pressure is related to solute concentration; higher solute concentration corresponds to higher osmotic pressure and lower water potential.
Conclude that the net movement of water during osmosis is from a region of higher water potential (lower solute concentration) to a region of lower water potential (higher solute concentration).
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