What is an energy carrier?

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Multiple Choice

What is an energy carrier?

Energy carriers are molecules that temporarily store energy and then transfer it to reactions that need it. In cells, this energy flow happens through molecules like ATP and the reduced carriers NADH, NADPH, and FADH2. During catabolic steps, energy from nutrients is captured in ATP’s high-energy phosphate bonds or in the reduced forms of these carriers. That stored energy is then released when needed to power endergonic reactions, drive biosynthetic processes, or do mechanical work. ATP is the classic example because its breakdown releases immediate usable energy for many cellular tasks. NADH and other electron carriers store reducing power and feed electrons into processes like oxidative phosphorylation to ultimately produce ATP. The other options describe energy storage or structural roles rather than the transient handoff of energy between processes. Long-term storage polymers hold energy over extended periods, structural proteins provide support, and a membrane lipid isn’t primarily an energy-transfer molecule.

Energy carriers are molecules that temporarily store energy and then transfer it to reactions that need it. In cells, this energy flow happens through molecules like ATP and the reduced carriers NADH, NADPH, and FADH2. During catabolic steps, energy from nutrients is captured in ATP’s high-energy phosphate bonds or in the reduced forms of these carriers. That stored energy is then released when needed to power endergonic reactions, drive biosynthetic processes, or do mechanical work.

ATP is the classic example because its breakdown releases immediate usable energy for many cellular tasks. NADH and other electron carriers store reducing power and feed electrons into processes like oxidative phosphorylation to ultimately produce ATP. The other options describe energy storage or structural roles rather than the transient handoff of energy between processes. Long-term storage polymers hold energy over extended periods, structural proteins provide support, and a membrane lipid isn’t primarily an energy-transfer molecule.

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