Question

Usable energy of respiration is

• A. Immediately consumed in cellular activities
• B. Trapped in ATP molecules
• C. Stored as heat
• D. Used in charging biomolecules into activity

Answer 1

Answer: (B)

Trapped in ATP molecules

Respiration is a complex process in which respiratory substrates are broken down through oxidation, accompanying with the release of energy and its storage in the form of ATP. The actual mechanism of respiration is not a single reaction. It is rather the stepwise degradation of the respiratory substrate consisting of many component reactions each catalyzed by a specific enzyme. The energy stored in the respiratory substrate is released slowly in the stepwise series of reactions thus trapping it in the form of energy storing molecule ATP.

Thus, the correct answer is option B.