Question

The release of the energy stored in ATP molecule takes place when it

• A. Passes electrons to NADH.
• B. Splits into a phosphate ion and ADP.
• C. Loses electrons and becomes ADP.
• D. Breaks its bonds and loses all its phosphate ions.
• E. Breaks the bonds within one of its phosphate groups.

Answer 1

The correct option is B Splits into a phosphate ion and ADP.

Adenosine triphosphate (ATP) is the energy currency of life. During cellular respiration, the energy formed in mitochondria is stored in the form of ATP. It provides energy for all the life activities by its breakdown into ADP and Pi. ATP contains three phosphate group which has high energy bond. On the hydrolysis of ATP energy is released and ADP formed. Since the basic reaction involves a water molecule, ATP + H${}_2$O → ADP + Pi, this reaction is commonly referred to as the hydrolysis of ATP.