Multiple Choice
In the context of passive transport, how is osmosis different from simple diffusion?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, which statement best describes how diffusion works in cells?
A
Movement of water across a selectively permeable membrane from lower solute concentration to higher solute concentration, driven by osmotic pressure.
B
Movement of molecules from a region of lower concentration to a region of higher concentration using ATP-powered membrane pumps.
C
Net movement of molecules from a region of higher concentration to a region of lower concentration due to random thermal motion, without requiring cellular energy input.
D
Vesicle-mediated transport that imports extracellular material into the cell via membrane invagination.
Verified step by step guidance1
Step 1: Understand the concept of passive transport, which is the movement of molecules across the cell membrane without the use of cellular energy (ATP).
Step 2: Recognize that diffusion is a type of passive transport where molecules move from an area of higher concentration to an area of lower concentration due to random thermal motion.
Step 3: Note that diffusion does not require energy input because it relies on the natural kinetic energy of molecules moving down their concentration gradient.
Step 4: Differentiate diffusion from other processes such as osmosis (movement of water), active transport (movement against concentration gradient using ATP), and vesicle-mediated transport (involving membrane invagination).
Step 5: Conclude that the best description of diffusion in cells is the net movement of molecules from higher to lower concentration driven by random motion, without energy expenditure.
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