How does the reductive (reverse) TCA cycle participate in carbon fixation? A) Some of the TCA reactions occur in reverse, assimilating small amounts of CO₂. B) CO₂ assimilation replenishes TCA intermediates for anabolic pathways. C) Reverse TCA regenerates acetyl-CoA, which may enter gluconeogenesis via pyruvate. D) All of the above. E) None of the above.

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Quizplus · Accepted Answer

The reductive (reverse) TCA cycle participates in carbon fixation by running some of the TCA cycle reactions in reverse to assimilate CO2, replenishing TCA intermediates for biosynthesis, and regenerating acetyl-CoA, which can then enter pathways like gluconeogenesis.

How Does the Reductive (Reverse) TCA Cycle Participate in Carbon