Multiple Choice
Which of the following statements about osmosis is correct?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following statements is correct regarding net diffusion across a membrane?
A
At equilibrium, particles stop moving so net diffusion continues in one direction without any opposing movement.
B
Net diffusion is the overall movement of particles from a region of higher concentration to a region of lower concentration due to random thermal motion.
C
Net diffusion moves particles from lower concentration to higher concentration and therefore requires ATP.
D
Net diffusion occurs only in liquids and cannot occur in gases or across biological membranes.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration, driven by random thermal motion of molecules.
Recognize that at equilibrium, particles continue to move randomly, but there is no net movement in any direction because the rates of movement in both directions are equal.
Recall that net diffusion does not require energy (ATP) because it is a passive process moving substances down their concentration gradient, not against it.
Know that diffusion can occur in gases, liquids, and across biological membranes, as it depends on the random motion of particles and the presence of a concentration gradient.
Conclude that the correct statement is the one describing net diffusion as the overall movement of particles from higher to lower concentration due to random thermal motion.
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