These molecules serve multiple essential functions, i ncluding energy storage, structural support, and cell signaling. For instance, glucose acts as a primary energy source for cellular processes, while starch and glycogen serve as energy reserves in plants and animals . . In biology, macromolecules refer to large organic molecules that form by polymerization, a process that joins smaller units called monomers via covalent bonds. Living organisms rely on these molecules for growth, reproduction, and day-to-day functions. There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids), and each is an important component of the cell and performs a. . The large molecules necessary for life that are built from smaller organic molecules are called biological macromolecules.
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