Multiple Choice
In passive transport, how does increasing the distance a molecule must travel (diffusion path length) affect the rate of diffusion across a medium when all other factors remain constant?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following statements is true of osmosis?
A
Osmosis is the diffusion of water across a membrane from higher solute concentration to lower solute concentration.
B
Osmosis is the net movement of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
C
Osmosis requires ATP hydrolysis to move water against its concentration gradient.
D
Osmosis is the movement of solute molecules down their concentration gradient through a membrane without transport proteins.
Verified step by step guidance1
Step 1: Understand the definition of osmosis. Osmosis is the movement of water molecules across a selectively permeable membrane.
Step 2: Identify the direction of water movement in osmosis. Water moves from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration).
Step 3: Recognize that osmosis does not require energy input (ATP hydrolysis) because it is a passive process driven by concentration gradients.
Step 4: Differentiate osmosis from diffusion of solutes. Osmosis specifically refers to water movement, not solute molecules, and it occurs through a membrane that is permeable to water but not to solutes.
Step 5: Conclude that the true statement is: 'Osmosis is the net movement of water across a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.'
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