23. The respiratory pathway is believed to be a catabolic pathway. However, the nature of the TCA cycle is amphibolic. Explain.
23. The respiratory pathway is believed to be a catabolic pathway. However, the nature of the TCA cycle is amphibolic. Explain.

Solution:

Because it breaks down the substrate, the respiratory route is thought to be catabolic. The pyruvate is broken down further in the TCA cycle to Acetyl CoA, which can then be synthesised into fatty acid anytime it is needed for fatty acid metabolism or synthesis. Both breakdown and synthesis occur during this cycle.