Question

The last stage of cellular respiration which yields ATP by the oxidation of organic molecules, derived from glucose is

• A. Chemiosmosis.
• B. Citric acid cycle.
• C. Electron transport chain.
• D. Glycolysis.
• E. Oxidation phosphorylation.

Answer 1

The correct option is E Oxidation phosphorylation.

Cellular respiration is a set of metabolic reactions and processes that take place in the cells to convert biochemical energy from the nutrients to ATP and release waste materials. These catabolic reactions break large molecules into smaller ones, releasing energy in the process, and the weak so-called "high-energy" bonds are replaced by stronger bonds in the products.Through cellular respiration the cells harvest energy stored in food by a catabolic pathway for the production of adenosine triphosphate (ATP). Cellular respiration is again aerobic and anaerobic. Aerobic respiration takes place in the presence of oxygen, where ATP is is produced by the cells through oxidation of organic compounds. Aerobic respiration takes place in three stages glycolysis, TCA cycle and electron transport chain. As the end product of glycolysis, pyruvate enters the mitochondria and is fully oxidized by the Krebs cycle. During this process, carbon dioxide and water and energy takes the form of ATP. However, most of the ATP produced during aerobic respiration is through oxidative phosphorylation.