Multiple Choice
In passive transport, what is the primary driving force for diffusion of molecules across space or a membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In passive transport, diffusion causes molecules to move in which direction?
A
Only through membrane pumps that require ATP.
B
From an area of lower concentration to an area of higher concentration (against the concentration gradient).
C
Only from the extracellular space into the cell, regardless of concentration.
D
From an area of higher concentration to an area of lower concentration (down the concentration gradient).
Verified step by step guidance1
Understand that passive transport is a process that does not require energy (ATP) and relies on the natural movement of molecules.
Recall that diffusion is a type of passive transport where molecules move from an area of higher concentration to an area of lower concentration.
Recognize that this movement occurs down the concentration gradient, meaning molecules spread out to balance concentrations on both sides of the membrane.
Note that membrane pumps requiring ATP are involved in active transport, not passive transport.
Conclude that in passive transport by diffusion, molecules move from higher to lower concentration without the need for energy input.
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