Multiple Choice
Which of the following is an example of passive transport across a cell membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following is an example of osmosis?
A
Sodium ions are pumped out of a cell against their concentration gradient using ATP.
B
Oxygen gas moves from the alveoli into the bloodstream down its concentration gradient.
C
Glucose molecules move from an area of high concentration to an area of low concentration through a membrane protein channel.
D
Water molecules move across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
Verified step by step guidance1
Understand the definition of osmosis: Osmosis is the passive movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Analyze each option by identifying whether it involves water movement and if it follows the criteria of osmosis.
For the first option, recognize that pumping sodium ions against their concentration gradient using ATP is active transport, not osmosis.
For the second option, note that oxygen gas moving down its concentration gradient is simple diffusion, not osmosis, and it involves gas molecules, not water.
For the third option, understand that glucose moving through a membrane protein channel is facilitated diffusion of solutes, not water movement, so it is not osmosis.
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