Multiple Choice
In the context of principles of transmembrane transport, which statement best distinguishes passive transport from active transport across a biological membrane?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
In the context of principles of transmembrane transport, which set correctly lists the three major types of active transport across cell membranes?
A
Ion channels, aquaporins, and carrier-mediated diffusion
B
Primary active transport, secondary active transport (cotransport), and vesicular (bulk) transport
C
Simple diffusion, facilitated diffusion, and osmosis
D
Uniport, symport, and antiport
Verified step by step guidance1
Understand that active transport requires energy to move substances across the cell membrane against their concentration gradient.
Recall that the three major types of active transport are categorized based on their energy source and mechanism: primary active transport uses ATP directly, secondary active transport uses the energy from an ion gradient, and vesicular transport moves large molecules or particles via membrane-bound vesicles.
Identify that ion channels, aquaporins, and carrier-mediated diffusion are mostly involved in passive transport processes, not active transport.
Recognize that simple diffusion, facilitated diffusion, and osmosis are all passive transport mechanisms that do not require energy.
Note that uniport, symport, and antiport describe types of carrier proteins based on the direction of transport but are not the broad categories of active transport themselves.
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