Glycolysis requires oxygen to occur.

Question

BlackTom AI · Accepted Answer

Glycolysis is an anaerobic pathway that takes place in the cytosol and does not require molecular oxygen (O2) to proceed.

1. Relevant knowledge points and concepts
- Glycolysis: a 10-step metabolic pathway that converts one glucose into two molecules of pyruvate, generating a net yield of 2 ATP and 2 NADH per glucose.
- Anaerobic vs. aerobic: “Anaerobic” means a process can occur without oxygen; “aerobic” processes require oxygen.
- NAD+ regeneration: glycolysis requires a supply of oxidized NAD+; when oxygen is absent, cells regenerate NAD+ via fermentation (e.g., lactate or ethanol production).

2. Step-by-step reasoning
- Step 1: Glycolysis proceeds through an ATP-investment phase (uses 2 ATP) and an ATP-payoff phase (produces 4 ATP), leaving a net +2 ATP. It also produces 2 NADH.
- Step 2: The pathway’s enzymes and intermediates function in the cytosol and do not use O2 as a substrate or cofactor.
- Step 3: If oxygen is present, pyruvate typically enters mitochondria for conversion to acetyl-CoA and subsequent aerobic respiration (ETC and oxidative phosphorylation), where NADH is reoxidized by the electron transport chain using O2. But that is a downstream, separate process.
- Step 4: If oxygen is absent, cells regenerate NAD+ by reducing pyruvate to lactate (animals) or to ethanol and CO2 (yeast), allowing glycolysis to continue anaerobically.

3. Intermediate/calculation steps
- Net ATP per glucose in glycolysis = 4 ATP produced − 2 ATP used = 2 ATP.
- NADH produced per glucose = 2 (requires reoxidation but not oxygen directly).

4. Why the correct answer is correct
- Glycolysis itself does not require oxygen and functions under both aerobic and anaerobic conditions, so the statement “Glycolysis requires oxygen to occur” is false.

5. Why the other option is incorrect
- “True” is incorrect because it conflates glycolysis with aerobic respiration; oxygen is required for oxidative phosphorylation, not for the glycolytic reactions.

Conclusion: The correct answer is False, matching the provided answer.

Glycolysis requires oxygen to occur.判断题

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