Multiple Choice
Which of the following transport proteins transports two molecules across the membrane in the same direction?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In cell biology, osmosis can be defined as which of the following?
A
The net movement of water across a selectively permeable membrane from lower solute concentration (higher water potential) to higher solute concentration (lower water potential)
B
The movement of water across a membrane using ATP-driven pumps against its concentration gradient
C
The net movement of solute molecules across a selectively permeable membrane from higher solute concentration to lower solute concentration
D
The bulk flow of water and solutes together through a membrane due to hydrostatic pressure (filtration)
Verified step by step guidance1
Understand the concept of osmosis in cell biology: it specifically refers to the movement of water molecules, not solutes, across a selectively permeable membrane.
Recall that osmosis occurs due to differences in solute concentration on either side of the membrane, which creates a difference in water potential.
Recognize that water moves from an area of lower solute concentration (which means higher water potential) to an area of higher solute concentration (which means lower water potential) to balance solute concentrations.
Note that osmosis does not require energy input like ATP and does not involve the movement of solutes themselves, only water.
Compare the given options and identify the one that correctly describes osmosis as the net movement of water across a selectively permeable membrane from lower solute concentration to higher solute concentration.
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