A) allow nutrients into the cells through specialized channels in the bacteria's outer membrane. B) allow electrolytes into the cells through specialized channels in the bacteria's outer membrane. C) act as a semi-permeable membrane and maintain the cell's osmotic pressure. D) function as transporter proteins involved in the removal of toxic substances from the interior of the cell to the external environment. A) allow nutrients into the cells through specialized channels in the bacteria's outer membrane. B) allow electrolytes into the cells through specialized channels in the bacteria's outer membrane. C) act as a semi-permeable membrane and maintain the cell's osmotic pressure. D) function as transporter proteins involved in the removal of toxic substances from the interior of the cell to the external environment.