Answer:
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.
So, a cell membrane is mostly made of phospholipids and proteins.
A cell membrane is mostly made of phospholipids and protein and they have their specific functions.
Cell membrane comprises of phosholipid bilayer which lipid and cholesterol and is useful in the selective passage of molecules in and out of the cell of the organism.
The proteins however are useful in terms of acting based on chemical
signals provided within the cell and in the transportation of materials
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