Which process can take place in the presence and absence of oxygen?
Correct answer: A. Glycolysis
- A. Glycolysis
- B. Pyruvic acid oxidation
- C. Krebs cycle
- D. Electron transport chain
Explanation
Glycolysis is the metabolic pathway that occurs in the cytoplasm of cells and is the first stage of cellular respiration. It is a central pathway for the breakdown of glucose (a six-carbon sugar) into two molecules of pyruvate (a three-carbon compound). Glycolysis can be aerobic or anaerobic, meaning it can occur in the presence or absence of oxygen. In the absence of oxygen (anaerobic conditions), the fate of pyruvate varies depending on the organism and the specific conditions.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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