Biology / Bio 0508 · Atom · ~20 seconds
ATP Structure
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ATP, adenosine triphosphate, is a nucleoside bound to three phosphate groups, its two outer phosphate bonds high-energy because their breakdown releases substantial free energy.
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ATP's three linked, negatively charged phosphates repel each other, making the molecule inherently unstable and quick to release energy on demand.
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Not every bond in ATP is high-energy — only the two linking its outer phosphate groups qualify.