the outer covering of the cell is made up of what
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Structure The cell membrane is made up of two layers that are composed of phospholipids. The bilayer is formed by the arrangement of phospholipids in a manner that their head regions (which are hydrophilic) face external environment as well as the internal cytosolic environment. The (hydrophobic) tails of these phospholipids face each other.
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Cell membranes are composed of proteins and lipids. Since they are made up of mostly lipids, only certain substances can move through. Phospholipids are the most abundant type of lipid found in the membrane. Phospholipids are made up of two layers, the outer and inner layers.
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