The proteins embedded in a membrane require that region of the protein to be

The proteins embedded in a membrane require that region of the protein to be hydrophobic.

The proteins embedded in a membrane are called transmembral proteins and they are a class of integral proteins (proteins that penetrate into or through the membrane bilayer). The portion of the transmembrane protein that is embedded in the membrane lipid bilayer must have residues that are not polar. Most common, these residues form a helix, that is hydrophobic and therefore stable within the bilayer.