<prompt> Which of the following membrane has the highest protein content per gram tissue:-Inner mitochondrial membraneOuter mitochondrial membranePlasma membraneMyelin sheath  <response>: Ans. is a is inner mitochondrial membrane .Ratio of protein to lipid in different membranes.Inner mitochondrial membrane -3.2 Max.Sarcoplasmic reticulum -2.0Outer mitochondrial membrane -1.1Myelin-0.23 In almost all the membranes of the body proteins are equal or exceed the quantity of lipid. The only exception is myelin high lipid content provide good insulation. 