A constituent of these biological structures called DSPC is used in the formulation of several mRNA vaccines. These structures’ flippases and scramblases facilitate transverse movement between their leaflets. An early sign of apoptosis is the formation of blebs in these structures. The rigidity (10[1])of these structures (10[1])at varying temperatures is controlled by their cholesterol content. Proteins in these structures (10[1])may be classified as “peripheral” or “integral.” (10[1])The fluid mosaic model of these structures describes how channel proteins are embedded in their phospholipid bilayers. For 10 points, name these structures that separate the interior and exterior of cells. ■END■