Multiple Choice
Which is an example of facilitated diffusion?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
In the context of principles of transmembrane transport, which molecule is most directly required to drive primary active transport across a membrane?
A
Oxygen ()
B
Glucose
C
ATP
D
Sodium ions ()
Verified step by step guidance1
Understand that primary active transport requires an energy source to move molecules against their concentration gradient across a membrane.
Recall that ATP (adenosine triphosphate) is the most common molecule that provides energy for primary active transport by hydrolyzing to ADP and inorganic phosphate, releasing energy.
Recognize that oxygen (O\_2) is primarily involved in cellular respiration and not directly in driving transport across membranes.
Note that glucose is typically transported by facilitated diffusion or secondary active transport, not directly by primary active transport.
Identify that sodium ions (Na\^+) are often moved by primary active transporters like the sodium-potassium pump, but the energy to move them comes from ATP, not the ions themselves.
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