The complete oxidation of sugar molecules by the cell takes place according to the general reaction

C₆H₁₂O₆ (glucose) + 6O₂ → 6CO₂ + 6H₂O + energy.

Which of the following statements are correct? Explain your answers.

A. All of the energy produced is in the form of heat.

B. None of the produced energy is in the form of heat.

C. The energy is produced by a process that involves the oxidation of carbon atoms.

D. The reaction supplies the cell with essential water.

E. In cells, the reaction takes place in more than one step.

F. Many steps in the oxidation of sugar molecules involve reaction with oxygen gas.

G. Some organisms carry out the reverse reaction.

H. Some cells that grow in the absence of O₂ produce CO₂.