Biosynthesis is the process by which living organisms produce complex molecules from simpler ones. This process is essential for creating vital compounds such as proteins, nucleic acids, and lipids, which are necessary for growth, repair, and energy storage. Enzymes play a crucial role in facilitating these chemical reactions, ensuring that the right molecules are formed efficiently. In plants, biosynthesis is responsible for producing important substances like glucose through photosynthesis, where sunlight is converted into chemical energy. Similarly, in animals, biosynthesis helps in the formation of hormones and neurotransmitters, which regulate various physiological functions. Overall, biosynthesis is fundamental to life, enabling organisms to maintain their structure and function.