Select all of the following that are true of the middle, lipid portion of the phospholipid bilayer. Solution it consists of non-polar fatty acid chains , whuch are hydrophobic and face the innterior of the bilayer. allows ions and polar molecules to pass through, but also acts as a barrier to ions and proteins passage so that they are prevented from diffusing into areas where they are not supposed to pass through. they are impermeable to water soluble (hydrophilic) molecules.