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
In the context of passive transport, osmosis is a membrane passage process pertaining to which of the following?
A
Bulk flow of fluid and dissolved solutes through a membrane via vesicle formation and fusion (endocytosis/exocytosis)
B
Transport of ions through a membrane pump that directly hydrolyzes ATP to move solutes against their electrochemical gradients
C
Net movement of water across a selectively permeable membrane down its water potential gradient (from lower solute concentration to higher solute concentration)
D
Net movement of solute molecules across a selectively permeable membrane from lower solute concentration to higher solute concentration using ATP
Verified step by step guidance1
Understand that osmosis is a specific type of passive transport involving the movement of water molecules, not solutes or bulk fluid.
Recall that passive transport means movement occurs without the input of cellular energy (ATP), relying on concentration or potential gradients.
Identify that osmosis specifically refers to the net movement of water across a selectively permeable membrane, moving from an area of lower solute concentration (higher water potential) to an area of higher solute concentration (lower water potential).
Differentiate osmosis from other transport processes such as bulk flow (endocytosis/exocytosis) and active transport (which requires ATP and moves solutes against gradients).
Conclude that the correct description of osmosis is the net movement of water across a selectively permeable membrane down its water potential gradient, without energy expenditure.
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