Multiple Choice
In the context of passive transport, which statement best defines osmosis?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, what is required for diffusion to occur across a medium or membrane?
A
A concentration gradient (a difference in solute concentration between two regions)
B
Vesicle formation and membrane fusion (endocytosis or exocytosis)
C
Direct input of ATP to power solute movement
D
A membrane carrier protein that binds the solute and undergoes a conformational change
Verified step by step guidance1
Understand that passive transport, such as diffusion, is the movement of molecules from an area of higher concentration to an area of lower concentration without the input of energy.
Recognize that for diffusion to occur, there must be a concentration gradient, meaning a difference in solute concentration between two regions, which drives the movement of molecules.
Note that vesicle formation and membrane fusion (endocytosis or exocytosis) are active transport processes and not involved in simple diffusion.
Acknowledge that direct input of ATP is required for active transport but not for passive diffusion, which relies on the natural kinetic energy of molecules.
Understand that while some transport requires membrane carrier proteins, simple diffusion does not require these proteins or conformational changes; it occurs directly across the membrane or medium if permeable.
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