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Read the TCA Cycle Entry and Turn
The TCA cycle oxidises acetyl groups while regenerating oxaloacetate and reduced coenzymes.
NSEB · Respiration in Plants · 2 linked questions · 100% coverage
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Study deeper: NCERT Biology · Respiration in Plants
Start with citrate formation
Acetyl-CoA (two carbons) condenses with oxaloacetate (four carbons) to form citrate. Oxaloacetate is regenerated by the end of a turn.
Count products per turn
Each acetyl-CoA produces two CO₂, three NADH, one FADH₂ and one GTP/ATP equivalent. NADH and FADH₂ must be reoxidised for the cycle to continue.
OlympIQ exam lens
- ✓Acetyl-CoA + oxaloacetate → citrate.
- ✓Two decarboxylations per turn.
- ✓Regenerate oxaloacetate and oxidised coenzymes.
OlympIQ trap
Do not confuse regeneration of oxaloacetate with net consumption of it.
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