Discussion
TCA cycle functions in
Answer: C
Correct answer: amphibolic reactions
The TCA cycle is amphibolic: it works in both directions of metabolism. It oxidises acetyl-CoA for energy (catabolic), and its intermediates are drawn off as precursors - oxaloacetate and α-ketoglutarate for amino acids, succinyl-CoA for porphyrins (anabolic). Anaplerotic reactions exist precisely to replace what is withdrawn.
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