Cell membranes are primarily composed of lipids , particularly phospholipids, which form a bilayer structure. This structure is essential for maintaining the integrity and functionality of the cell by allowing selective permeability. While proteins and carbohydrates are also present, lipids are the main component responsible for cell membrane structure. ;
Cell membranes are primarily made of lipids, particularly phospholipids, which form a bilayer essential for the membrane's structure and function. This bilayer allows selective permeability, regulating substance movement in and out of the cell. The correct answer to the question is D. lipid.
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