Multiple Choice
In the context of passive transport (diffusion and osmosis), which process requires no energy input (ATP) from the cell?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which option best defines osmosis in the context of passive transport across biological membranes?
A
The net movement of solute molecules across a membrane from lower solute concentration to higher solute concentration using ATP
B
The net movement of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration (higher water potential to lower water potential)
C
The movement of any molecules across a membrane through transport proteins down their electrochemical gradient
D
The bulk flow of fluid driven by a pressure gradient (hydrostatic pressure) through a tube or tissue
Verified step by step guidance1
Step 1: Understand the concept of osmosis as a type of passive transport, which means it does not require energy (ATP) to occur.
Step 2: Recognize that osmosis specifically involves the movement of water molecules, not solute molecules, across a selectively permeable membrane.
Step 3: Identify the direction of water movement in osmosis: from a region of lower solute concentration (higher water potential) to a region of higher solute concentration (lower water potential).
Step 4: Differentiate osmosis from other types of transport such as active transport (which uses ATP), diffusion of solutes, and bulk flow driven by pressure gradients.
Step 5: Conclude that the best definition of osmosis is the net movement of water across a selectively permeable membrane from lower solute concentration to higher solute concentration, consistent with passive transport principles.
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