Cellular respiration harvests the most chemical energy from which of the following?

a. generating carbon dioxide and oxygen in the electron transport chain

b. converting oxygen to ATP

c. substrate-level phosphorylation

d. transferring electrons from organic molecules to pyruvate

e. chemiosmotic phosphorylation

Answer: The answer is B

Explanation:

Cellular respiration harvest most chemical energy from converting oxygen to ATP. During cellular respiration, most ATP produced are generated by oxidative phosphorylation, which uses the energy released by redox reactions in the electron transport chain to male ATP. The electrons are finally passed to oxygen which is reduced to water.