Bchintermediate
Explain why lactate formation supports continued glycolysis when oxygen is unavailable.
Answer
Lactate dehydrogenase reduces pyruvate to lactate using NADH, thereby oxidizing NADH back to NAD+. Glycolysis requires NAD+ during glyceraldehyde-3-phosphate oxidation, so its regeneration permits continued ATP production without oxygen.
Explanation
### What a good answer covers
- Pyruvate is the product of glycolysis and the substrate for lactate formation.
- Lactate dehydrogenase transfers reducing equivalents from NADH to pyruvate.
- The reaction restores NAD+, which glycolysis needs to oxidize glyceraldehyde-3-phosphate.
- Lactate formation permits glycolytic ATP production without requiring oxygen directly.
### Terms
- **NADH**: Reduced nicotinamide adenine dinucleotide, which carries electrons.
- **NAD+**: The oxidized form required in the glycolytic oxidation step.
- **Lactate dehydrogenase**: The enzyme catalyzing pyruvate-lactate interconversion.
### Remember
The main metabolic value of lactate formation here is NAD+ recycling.
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