LIFE SCIENCE

Detailed explanation-1: -The ratio of protein and lipids varies considerably in different cell types. The membrane of the erythrocytes has approximately 52% of proteins and 40% lipids.

Detailed explanation-2: -Here we show that the area occupied by protein and lipid at the center of the human red blood cell (RBC) plasma membrane is at least ≈23% protein and less than ≈77% lipid.

Detailed explanation-3: -So, the correct option is ‘ Approximately 40% proteins and 52 % lipids ‘.

Detailed explanation-4: -Sprectrin and actin are the two main structural proteins that together form a submembranous cytoskeletal meshwork that is responsible for the viscoelastic properties of the erythrocyte membrane.