Multiple Choice
Which of the following is NOT a form of passive transport across a cell membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In passive transport by diffusion, what is the principal force driving the net movement of molecules?
A
Vesicular transport via endocytosis and exocytosis
B
A concentration gradient (difference in solute concentration across space)
C
ATP hydrolysis providing energy for molecular pumps
D
Directional movement generated by motor proteins along microtubules
Verified step by step guidance1
Understand that passive transport by diffusion involves the movement of molecules from an area of higher concentration to an area of lower concentration without the input of cellular energy.
Recognize that the principal driving force for this movement is the concentration gradient, which is the difference in solute concentration across a space or membrane.
Note that vesicular transport (endocytosis and exocytosis) and motor protein movement require energy and are not forms of passive transport.
Recall that ATP hydrolysis provides energy for active transport mechanisms, not passive diffusion.
Conclude that the net movement of molecules in passive diffusion is driven by the concentration gradient, moving molecules down their concentration gradient until equilibrium is reached.
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