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B
Nucleoprotein
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C
Polysaccharides
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D
Lipoprotein
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Solution
The correct option is A Phospholipid
The cell membrane is a phospholipid bilayer that are selectively permeable membranes which separate the interior of the cells (cell organelles and cytoplasm) from the outside environment or the extracellular space.
These biological membranes or bilayers are made up of amphiphilic phospholipids which have both hydrophilic phosphate head and a hydrophobic tail that consists of two fatty acid chains.
Lipoproteins are single layered membrane composed of phospholipid molecules on their outside which surrounds a central core.