Multiple Choice
In the context of principles of transmembrane transport, how is active transport similar to facilitated diffusion?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
Which of the following sets correctly lists three major types of active transmembrane transport used by cells?
A
Channel-mediated transport, carrier-mediated transport, and gated diffusion
B
Simple diffusion, facilitated diffusion, and osmosis
C
Uniport, symport, and antiport
D
Primary active transport, secondary active transport (cotransport), and vesicular (bulk) transport
Verified step by step guidance1
Understand that active transmembrane transport requires energy input, usually from ATP hydrolysis or an ion gradient, to move substances against their concentration gradient.
Recall that primary active transport directly uses ATP to pump molecules across the membrane, such as the sodium-potassium pump.
Recognize that secondary active transport (also called cotransport) uses the energy stored in an ion gradient created by primary active transport to move other substances, including uniport, symport, and antiport mechanisms.
Identify vesicular (bulk) transport as a form of active transport involving the movement of large molecules or particles via vesicles, including endocytosis and exocytosis.
Compare the options given and note that channel-mediated transport, simple diffusion, facilitated diffusion, and osmosis are passive processes, while uniport, symport, and antiport describe types of carrier proteins but not the major categories of active transport themselves.
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