Which of the following processes 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 first stage of cellular respiration that occurs in the cytoplasm and can happen with or without oxygen. It breaks one glucose molecule into two pyruvate molecules, producing a small amount of ATP and NADH.
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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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