Question

The total amount of energy released from one molecule of glucose on oxidation is about

• A. $1600kJ$
• B. $2300kJ$
• C. $2500kJ$
• D. $2900kJ$

Answer 1

The correct option is D $2900kJ$

The glucose molecule is oxidised to form pyruvic acid which is further oxidised to release water and carbon dioxide. When one glucose molecule is completely oxidised, 38 ATP molecules are formed. The energy of the 38 ATP is equal to about 2900 kJ or 686 kcal of energy. The equation of the glucose oxidation is given as

C${}_6$ H${}_{12}$ O${}_6$ + 6O${}_2$ $\to$ 6CO${}_2$ + 6H${}_2$O + 2900 kJ energy

Thus, the correct answer is option D.