Cellular Energy

AP Biology· difficulty 2/5

Adenine Ribose P P P ~ ~ High-energy bond

Why is energy released when ATP is hydrolyzed to ADP + Pi?

  • A

    The ribose ring opens, releasing potential energy

  • B

    The terminal phosphate covalent bond is unusually strong

  • C

    Adenine is reduced during hydrolysis

  • D

    Repulsion between negatively charged phosphates is relieved and products are more stable than reactants

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Explanation

The three negatively charged phosphates repel one another. Hydrolysis of the terminal phosphate releases energy because the products (ADP + Pi) are more stable than ATP.

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