How is energy released?

How is energy released?

• A. Bonds of ATP are broken
• B. Bonds of ATP are formed
• C. Energy is absorbed
• D. Energy is stored in ATP

Answer: (A)

Energy release from ATP comes from hydrolysis of the bond that links the terminal (outermost) phosphate to the rest of the molecule. When water cleaves that bond, ATP is converted to ADP and inorganic phosphate, and a considerable amount of energy is released. This happens because the products are more stable than ATP, and the negative charges on the phosphate groups relieve repulsion, making the overall process exergonic. The energy released is what cells use to drive work, such as muscle contraction, active transport, and biosynthetic reactions. The other options don’t describe this main mechanism: energy is not released by forming bonds in this context, and ATP’s role is to store and transfer energy rather than release it by bond formation or merely absorb energy.

Energy release from ATP comes from hydrolysis of the bond that links the terminal (outermost) phosphate to the rest of the molecule. When water cleaves that bond, ATP is converted to ADP and inorganic phosphate, and a considerable amount of energy is released. This happens because the products are more stable than ATP, and the negative charges on the phosphate groups relieve repulsion, making the overall process exergonic. The energy released is what cells use to drive work, such as muscle contraction, active transport, and biosynthetic reactions. The other options don’t describe this main mechanism: energy is not released by forming bonds in this context, and ATP’s role is to store and transfer energy rather than release it by bond formation or merely absorb energy.