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
Multiple Choice
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)
Verified step by step guidance1
Understand that passive transport is the movement of molecules across a membrane without the input of cellular energy (ATP).
Recall that diffusion is a type of passive transport where molecules move from an area of higher concentration to an area of lower concentration.
Identify that the driving force for diffusion is the concentration gradient, which is the difference in solute concentration across the membrane.
Recognize that electrical gradients can influence the movement of charged molecules (ions), but in general passive diffusion is primarily driven by concentration differences.
Note that ATP hydrolysis and vesicular trafficking are active processes and do not drive passive transport.
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