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

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 uses up TCA intermediates for anabolic pathways.
C) Reverse TCA regenerates succinyl-CoA, which may enter gluconeogenesis.
D) A large amount of ATP is generated.
E) All reactions take place in a carboxysome.

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