Summary
The chapter illustrates that the complex metabolic pathways in living organisms follow the same fundamental organic reaction mechanisms encountered in laboratory chemistry. Major pathways including glycolysis, beta-oxidation, the citric acid cycle, gluconeogenesis, and protein deamination are interconnected through common intermediates such as acetyl CoA, which is central to energy production. Moreover, a discussion of pericyclic reactions underscores that concerted processes governed by orbital symmetry rules are not only relevant in synthetic organic chemistry but also in certain biological transformations such as vitamin D synthesis.