Multiple Choice
In the context of principles of transmembrane transport, how is facilitated diffusion similar to simple diffusion?
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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 major types of active transport used by cells to move substances against their electrochemical gradients?
A
Simple diffusion and facilitated diffusion
B
Primary active transport and secondary active transport
C
Exocytosis and endocytosis
D
Osmosis and filtration
Verified step by step guidance1
Understand that active transport refers to the movement of substances across a cell membrane against their electrochemical gradient, which requires energy input.
Recognize that the two major types of active transport are classified based on the source of energy used to drive the transport process.
Primary active transport directly uses energy, usually from ATP hydrolysis, to move molecules against their gradient. An example is the sodium-potassium pump.
Secondary active transport uses the energy stored in the electrochemical gradient of one molecule (established by primary active transport) to drive the movement of another molecule against its gradient. This includes symporters and antiporters.
Therefore, the two major types of active transport are primary active transport and secondary active transport.
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