Which of the following statements about the outer membrane of Gram-negative cell wall is FALSE?

A. The outside leaflet is largely composed of lipopolysaccharides.

B. The outer membrane contains porins that allow passage of molecules and ions directly into the periplasmic space.

C. The outer membrane acts as a protective barrier to many toxic compounds.

D. The lipid A part of the lipopolysaccharide molecule is toxic to humans.

E. None of these choices are correct.

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