What is a porin?
A) An inner membrane pore that allows proteins out into the cytoplasm
B) Outer membrane pores that allow the membrane to "breathe"
C) Substrates for enzymes that enable protein synthesis
D) Outer membrane channels that permit the inflow of nutrients and the outflow of wastes

Question

Quizplus · Accepted Answer

Porins are integral membrane proteins that form channels in the outer membrane of Gram-negative bacteria, allowing the inflow of nutrients and the outflow of wastes. They are involved in the passive diffusion of small hydrophilic solutes that are too large to pass through the lipid bilayer.

What Is a Porin