Discussion
Porins are located in
Answer: A
Correct answer: the outer membrane of gram-negative bacteria
Porins are trimeric barrel proteins spanning the outer membrane, forming water-filled channels through which small hydrophilic molecules diffuse. They are the reason the outer membrane is a selective barrier rather than an impermeable one - and why large antibiotics, which cannot pass the pores, are so often ineffective against gram-negative bacteria.
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