Which of the following statements about the role of ATP in cell metabolism is true?

a. The free energy released by ATP hydrolysis has a much more negative Î"G value than the hydrolysis of phosphate groups from other phosphorylated molecules.

b. The energy from the hydrolysis of ATP may be directly coupled to endergonic processes by the transfer of the phosphate group to another molecule.

c. The phosphate bonds of ATP are unusually strong bonds.

The energy from the hydrolysis of ATP may be directly coupled to endergonic processes by the transfer of the phosphate group to another molecule. (Ans. B)

Explanation:

ATP is a complex chemical which provides energy for many processes in living cells.

ATP hydrolysis is known as the catabolic reaction. High energy phophoanhydride bond present in adenosine triphosphate where chemical energy has been stored and released by splitting of these bonds. (high energy phophoanhydride bonds)

ATP is formed by the combination of ADP and phosphate group. The energy is released by the hydrolysis of ATP is used for the cellular works. This energy is mainly used by the coupling endergonic reactions with exergonic reaction of ATP hydrolysis.

B. A form of energy coupling refers to using the release of energy from exergonic hydrolysis of ATP to initiate other endergonic reactions for cellular metabolism.