Multiple Choice
In the context of passive transport, what is required for diffusion to occur across a medium or membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In passive transport, what is the primary driving force of diffusion across a membrane?
A
A concentration gradient (difference in solute concentration) that produces net movement from high to low concentration
B
Active pumping by membrane transporters that move solutes from low to high concentration
C
Vesicular transport that packages molecules into vesicles for movement across the membrane
D
ATP hydrolysis providing energy to move molecules against their concentration gradient
Verified step by step guidance1
Understand that passive transport involves the movement of molecules across a membrane without the input of cellular energy (ATP).
Recognize that diffusion is a type of passive transport where molecules move from an area of higher concentration to an area of lower concentration.
Identify the primary driving force for diffusion as the concentration gradient, which is the difference in solute concentration across the membrane.
Note that this concentration gradient causes net movement of molecules down their gradient, meaning from high concentration to low concentration, until equilibrium is reached.
Distinguish passive transport from active transport and vesicular transport, which require energy input and move molecules against their concentration gradients or via vesicles.
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