<prompt> Maximum protein to lipid ratio is seen in -Inner mitochondrial membraneOuter mitochondrial membraneSarcoplasmic reticulumMyelin sheath membrane  <response>: Ans. is a i.e., Inner mitochondrial membrane o Mitochondrial inner membrane has maximum protein contents with highest protein to lipid ratio and cell membrane in myelin has lowest protein to lipid ratio.o Protein to lipid ratio in decreasing order of frequency is as follows:o Inner mitochondrial membrane 3.2: Maximum Sacroplasmic reticulum 2?0 outer mitochondrial membrane 1?1 Human erythrocyte cell membrane 1.1 Myelin sheath cell plasma membrane 0-23: Minimumo In all the membranes, proteins content is higher than lipid, with only one major exception of myelin which has higher lipid content that protein to provide good insulation. 