The oxygen consumed during cellular respiration is involved directly in which process or event?

A) the citric acid cycle

B) the phosphorylation of ADP to form ATP

C) accepting electrons at the end of the electron transport chain

D) glycolysis

E) the oxidation of pyruvate to acetyl CoA

C

Explanation:

The oxygen consumed during cellular respiration is involved directly in C) accepting electrons at the end of the electron transport chain process or event.

The electron transport chain is the section of aerobic respiration that requires free oxygen as the last electron acceptor in the glucose catabolism of the electrons withdrawn from the intermediate compounds.

C) accepting electrons at the end of the electron transport chain

Explanation:

Cellular respiration is a series of reactions which is associated with the oxidation of glucose. The respiration reactions are divided into 4 phases: Glycolysis, Pyruvate decarboxylation, Krebs cycle and electron transport chain.

The cellular respiration usually takes place in the presence of oxygen which is not utilized until the last stage of the electron transport chain. In the electron transport chain, the oxygen acts as an electron acceptor as it accepts the electron and is converted to metabolic water.

Thus, the selected option is the correct answer.