Multiple Choice
Which of the following is an example of active transmembrane transport (requires energy input to move a solute against its electrochemical gradient)?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
In the context of principles of transmembrane transport, what are the two main types of active transport across cellular membranes?
A
Primary active transport and secondary active transport
B
Simple diffusion and facilitated diffusion
C
Osmosis and filtration
D
Endocytosis and exocytosis
Verified step by step guidance1
Understand that transmembrane transport refers to the movement of substances across the cell membrane, which can occur via passive or active mechanisms.
Recall that active transport requires energy input to move molecules against their concentration gradient, unlike passive transport which does not require energy.
Identify the two main types of active transport: Primary active transport, which directly uses energy (usually from ATP hydrolysis) to move molecules, and Secondary active transport, which uses the energy stored in an ion gradient created by primary active transport to move other substances.
Recognize that simple diffusion and facilitated diffusion are passive transport mechanisms, osmosis and filtration are types of passive movement of water and solutes, and endocytosis and exocytosis are forms of bulk transport, not classified under active transport types in this context.
Conclude that the two main types of active transport across cellular membranes are Primary active transport and Secondary active transport.
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