What is the primary energy carrier?

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Multiple Choice

What is the primary energy carrier?

ATP is the direct energy currency of the cell. It powers most cellular work by releasing energy when it’s hydrolyzed to ADP and inorganic phosphate, which enzymes and transporters can immediately couple to their reactions. This direct action is what makes ATP the primary energy carrier. NADH and FADH2, by contrast, store energy as high-energy electrons and feed that energy into the electron transport chain to drive ATP production. They’re important for generating ATP, but they’re not the molecule used to do work on its own. Acetyl-CoA is a key metabolic intermediate that donates acetyl groups to the TCA cycle to help generate reducing equivalents and later ATP, but it isn’t the direct energy currency either.

ATP is the direct energy currency of the cell. It powers most cellular work by releasing energy when it’s hydrolyzed to ADP and inorganic phosphate, which enzymes and transporters can immediately couple to their reactions. This direct action is what makes ATP the primary energy carrier.

NADH and FADH2, by contrast, store energy as high-energy electrons and feed that energy into the electron transport chain to drive ATP production. They’re important for generating ATP, but they’re not the molecule used to do work on its own. Acetyl-CoA is a key metabolic intermediate that donates acetyl groups to the TCA cycle to help generate reducing equivalents and later ATP, but it isn’t the direct energy currency either.

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