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The basic structural framework of the plasma membrane is

  • A.a network of cholesterol
  • B.a phospholipid bilayer
  • C.a sheet of protein
  • D.a layer of cellulose

Answer: B

Phospholipids assemble spontaneously into a bilayer in water, and proteins are embedded within that framework rather than forming it. Cholesterol modulates the bilayer's properties but does not build it, and plant cells substitute other sterols entirely.

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