Which of the following correctly describes the structural organization of the cell membrane?
A. Rigid layers of protein molecules in which carbohydrate molecules are suspended
B. A bilayer of phospholipid molecules in which protein molecules are embedded and can move
C. A solid, rigid layer of phospholipid with loosely bound protein molecules
D. Three layers; lipid on the inside, protein in the middle, and carbohydrates (and polysaccharides) on the outside
Answer: B
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