Multiple Choice
In the context of passive transport (diffusion and osmosis), what happens to an animal cell placed in an isotonic solution relative to its cytosol?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In cell biology, diffusion is an example of which type of transport across membranes?
A
Active transport that uses ATP to move solutes against their concentration gradient
B
Bulk transport via exocytosis that exports molecules out of the cell
C
Vesicular transport via endocytosis that internalizes extracellular material
D
Passive transport driven by a concentration gradient, requiring no cellular energy input
Verified step by step guidance1
Understand the definition of diffusion: it is the movement of molecules from an area of higher concentration to an area of lower concentration.
Recognize that diffusion does not require cellular energy (ATP) because it follows the natural concentration gradient.
Identify that transport mechanisms requiring energy, such as active transport, move substances against their concentration gradient, which is different from diffusion.
Distinguish diffusion from bulk transport processes like exocytosis and endocytosis, which involve vesicles and cellular machinery.
Conclude that diffusion is a form of passive transport driven solely by the concentration gradient without energy input.
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