Multiple Choice
In passive transport, how does increasing temperature affect the rate of diffusion of small molecules across a solution or membrane (assuming no phase change and constant concentration gradient)?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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Which scenario is the best model of diffusion (passive movement of particles down their concentration gradient)?
A
Perfume molecules spreading from a high concentration near the spray to a lower concentration throughout a room
B
Glucose entering a cell via a membrane pump that uses ATP to move it against its concentration gradient
C
Water moving across a selectively permeable membrane toward the side with higher solute concentration (osmosis)
D
Ions moving through a membrane channel from lower concentration to higher concentration because of energy input
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Passive Transport: Diffusion and Osmosis practice set
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