The macromolecule that serves as the main structural component of cell membranes is lipids.
The correct answer is lipids. Lipids serve as the main structural component of cell membranes. To arrive at this answer, you can recall your knowledge of cell biology and the composition of cell membranes. Cell membranes consist of a phospholipid bilayer, in which two layers of lipids (phospholipids) form the basic structure. This lipid bilayer provides the framework for cell membranes and gives them their flexibility and selective permeability. Additionally, proteins are also present in cell membranes and play important roles, such as transportation of molecules across the membrane, cell signaling, and structural support. However, lipids serve as the main structural component.
