opyright@ The Me Graw-Hill Companies, Inc. Permission required for reproduction or display. Extracellular fluid -NH2 Transmembrane nonpolar segment 0= Phospholipid bilayer o90 0=O 00=05 Intracellular fluid Schematic cartoon of a transmembrane proteinCircles represent amino acids in the linear sequence of the protein Schematic cartoon of a transmembrane protein The amino acids along the membrane section are likely to have non -polar side chains