Multiple Choice
Which scenario is the best model of diffusion (passive movement of particles down their concentration gradient)?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
During osmosis, water moves primarily in response to a difference in which of the following across a selectively permeable membrane?
A
Active transport of solutes from low to high concentration using ATP
B
Water potential (osmotic gradient) caused by differences in solute concentration
C
Electrical gradient created by unequal distribution of charged ions
D
Bulk flow driven by hydrostatic pressure through open pores without selectivity
Verified step by step guidance1
Understand that osmosis is the movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Recognize that water movement during osmosis is driven by differences in water potential, which is influenced by solute concentration (osmotic gradient).
Recall that active transport involves energy expenditure to move solutes against their concentration gradient, but osmosis itself is a passive process driven by water potential differences, not active transport.
Note that electrical gradients affect charged particles but do not directly drive the bulk movement of water during osmosis.
Understand that bulk flow driven by hydrostatic pressure involves movement of fluids through open pores and is not selective, whereas osmosis specifically involves water movement through a selectively permeable membrane in response to osmotic gradients.
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