Gram negative bacterias have two layer cell wall (peptidoglycan and LPS) but still small molecules can go thru it. Why? Is it something related to porins or gram negative bacteria's cell wall has pores in both of it's layers

Thanks in advance
Mehmet Yeniyap?
Molecular Biology and Genetics Student
Turkey - Bulent Ecevit University

The cell wall is quite porous. Porins are specific in what they allow in and are found in the plasma membrane.