Which of the following is a principle of the fluid mosaic model of cell membrane structure?
A) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.
B) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains.
C) All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
D) The lipid bilayer is a solid at body temperature, thus protecting the cell.
A
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