Show that overexpression of a single gene encoding the plasma membrane H -ATPase 1 OSA1 is. The model has evolved somewhat over time but it still best accounts for the structure and functions of the plasma membrane as we now understand them. Cell Membrane Information Worksheet Answers Cell Membrane Biology Worksheet Cells Worksheet TSPAN family of proteins are generally considered to assemble as multimeric complexes on the plasma membrane. . The fluid mosaic model describes the structure of the plasma membrane as a mosaic of componentsincluding phospholipids cholesterol proteins and carbohydratesthat gives the membrane a fluid. A plasma membrane is mainly composed of carbohydrates phospholipids proteins conjugated molecules which is about 5 to 8 nm in thickness. 1988 1993 initially reported differences between the lipid compositions of the producer cell and HIV-1 membranes with virion enrichment of sphingomyelin SM phosphatidyl serine PS p...