Biochemical synthesis refers to the process by which living organisms produce complex molecules from simpler ones through chemical reactions. This process is essential for creating vital substances such as proteins, nucleic acids, and lipids, which are necessary for life. Enzymes, which are specialized proteins, play a crucial role in facilitating these reactions by lowering the energy required for them to occur. In nature, biochemical synthesis occurs in various pathways, such as the Krebs cycle and photosynthesis. These pathways involve a series of enzymatic reactions that convert substrates into products, ultimately supporting cellular functions and growth. Understanding biochemical synthesis is important in fields like biotechnology and medicine, where it can be applied to develop new drugs and therapies.