Discussion
Which is most likely to be exposed on the surface of a gram-negative bacterium?
Answer: A
Correct answer: Pore protein (porin)
Porins span the outer membrane and form water-filled channels through which small hydrophilic molecules diffuse in, so they are exposed at the surface. Lipoteichoic acid belongs to gram-positive cells; the energy-generating proteins are in the inner membrane; and the phospholipids of the outer membrane face inwards, with LPS on the outer leaflet.
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