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A sequence of reactions that has a specific purpose (for instance: degradation of glucose, synthesis of fatty acids) is called **metabolic pathway.** Metabolic pathways may be: - **Linear** (Shown by an example with a linear metabolic pathway with the following intermediates: 3-Phosphoglycerate, 3-...

A sequence of reactions that has a specific purpose (for instance: degradation of glucose, synthesis of fatty acids) is called **metabolic pathway.** Metabolic pathways may be: - **Linear** (Shown by an example with a linear metabolic pathway with the following intermediates: 3-Phosphoglycerate, 3-Phosphohydroxypyruvate, 3-Phosphoserine and Serine.) - **Cyclic** (Shown by an example with a cyclic metabolic pathway with the following intermediates: Acetyl CoA, Oxaloacetate, Citrate, Isocitrate, α-Ketoglutarate, Succinyl CoA, Succinate, Fumarate and Malate). - **Spiral pathway** (Shown by an example with a spiral metabolic pathway related to the fatty acid biosynthesis.)