Multiple Choice
In most cells, which molecule is directly used as the immediate energy source to drive primary active transport across membranes?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
In the principles of transmembrane transport, which molecule is directly required to provide energy for primary active transport across a membrane?
A
Glucose
B
Oxygen (O2)
C
ATP
D
ADP
Verified step by step guidance1
Understand that primary active transport requires direct energy input to move molecules against their concentration gradient across a membrane.
Recall that the energy for primary active transport is typically provided by the hydrolysis of a high-energy molecule.
Identify ATP (adenosine triphosphate) as the molecule that provides this energy by releasing a phosphate group and converting to ADP (adenosine diphosphate).
Recognize that glucose and oxygen are not direct energy sources for primary active transport; glucose is often transported by facilitated diffusion or secondary active transport, and oxygen is used in cellular respiration but not directly in transport.
Conclude that ATP is the molecule directly required to provide energy for primary active transport across membranes.
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