Multiple Choice
How does increasing diffusion distance affect the rate of diffusion across a membrane (all else being equal)?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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In the context of diffusion and osmosis, what best defines passive transport across a cell membrane?
A
Movement of substances using vesicles to import or export large particles (endocytosis or exocytosis)
B
Movement of substances against their concentration gradient using energy from ATP-driven pumps
C
Movement of substances down their concentration or electrochemical gradient without direct input of cellular energy (ATP)
D
Movement of substances only through membrane proteins and always requiring ATP hydrolysis
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Passive Transport: Diffusion and Osmosis practice set
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