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Which series of reactions actually uses oxygen? a. Glycolysis b. fermentation c. the Krebs (Citric Acid)...

Which series of reactions actually uses oxygen?

a. Glycolysis

b. fermentation

c. the Krebs (Citric Acid) Cycle

d. the Electron Transport System

e. protein synthesis

f. gluconeogenesis

Science   Anatomy-And-Physiology   
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Answer #1

Ans- d. the Electron Transport system

Oxygen plays the most crucial role in the electron transport chain to produce energy. Here it acts as a final electron acceptor and picks up protons for formation of water. When oxygen accepts the electron, then only ATP is formed.

Glycolysis is anerobic process which occurs in all organisms because there is no utilisation of oxygen. It takes place in cytoplasm of prokaryotes and eukaryotes both. Fermentation is the process of formation of ATP in the absence of oxygen and it involves glycolysis not the other two stages of aerobic respiration. Krebs cycle is considered aerobic but the use of oxygen is indirect not directly. Protein synthesis takes place in the process of translation where oxygen is not required. Gluconeogenesis is the formation of glucose from non carbohydrate sources and involves no use of oxygen.

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