7. Cell membranes are composed mostly of _____________ organized into a lipid bilayer which serves as an effective barrier to the passage of water, ions, and other components into and out of cells.
(A) glycerophospholipids
(B) sphingomyelins
(C) prostaglandins
(D) lipids
(E) fatty acid

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統計： A(12), B(2), C(0), D(1), E(4) #2241180