Multiple Choice
In the context of principles of transmembrane transport, which molecule is most directly required to drive primary active transport across a membrane?
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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 cell membranes?
A
Passive transport and bulk flow
B
Simple diffusion and facilitated diffusion
C
Primary active transport and secondary active transport
D
Osmosis and filtration
Verified step by step guidance1
Step 1: Understand that transmembrane transport refers to the movement of substances across the cell membrane, which can occur via passive or active mechanisms.
Step 2: Recall that passive transport does not require energy and includes processes like simple diffusion, facilitated diffusion, osmosis, and filtration.
Step 3: Recognize that active transport requires energy (usually ATP) to move substances against their concentration gradient.
Step 4: Identify the two main types of active transport: Primary active transport, which directly uses ATP to transport molecules, and Secondary active transport, which uses the energy stored in an ion gradient created by primary active transport to move other substances.
Step 5: Conclude that the correct classification of active transport types across cell membranes is Primary active transport and Secondary active transport.
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