Question

Usable energy available from respiration is

• A. 10%
• B. 30%
• C. 40%
• D. 50%

Answer 1

The correct option is D 50%

One mole of glucose on complete oxidation to carbon dioxide and water produces about 690,000 calories. About 10,000 calories are needed to form the high energy phosphate bonds in one mole of ATP. 36 or 38 moles of ATP formed in respiration process will trap 360,000 or 380,000 calories. The remaining 330, 000 or 310,000 calories are lost as heat. Thus about 52% of the energy released from glucose is trapped in ATP.

Thus, the correct answer is option D.