Multiple Choice
In the context of passive transport, does facilitated diffusion require an input of cellular energy (ATP) to move solutes across a membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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In passive transport, the principal force driving net movement of molecules during diffusion across a membrane is the:
A
Electrical gradient alone, independent of concentration differences
B
ATP hydrolysis providing energy for transport proteins
C
Vesicular trafficking via endocytosis and exocytosis
D
Concentration gradient (difference in solute concentration across space)
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