Substrates for biosynthesis of lipids and amino acids derive from the __________ pathways of glycolysis and the TCA cycle.

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The term "amphibolic" refers to metabolic pathways that can function both catabolically (breaking down molecules for energy) and anabolically (using molecules to build new compounds). The glycolysis and TCA cycle pathways are examples of amphibolic pathways because they not only generate energy (catabolism) but also produce substrates for biosynthesis (anabolism) of lipids and amino acids.

Substrates for Biosynthesis of Lipids and Amino Acids Derive from the __________