Multiple Choice
During osmosis across a selectively permeable membrane, in which direction will water molecules move overall?
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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
Oxygen molecules move from the alveoli into the bloodstream down their concentration gradient.
B
Sodium ions are pumped out of a cell against their concentration gradient using ATP.
C
Water moves across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
D
Glucose enters a cell through a membrane transporter down its concentration gradient.
Verified step by step guidance1
Step 1: 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.
Step 2: Analyze each option to determine if it involves water moving across a membrane due to solute concentration differences.
Step 3: The first option describes oxygen molecules moving down their concentration gradient, which is diffusion, not osmosis.
Step 4: The second option involves active transport of sodium ions using ATP, which is active transport, not osmosis.
Step 5: The third option describes water moving across a selectively permeable membrane from lower to higher solute concentration, which matches the definition of osmosis.
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