Fluid Mosaic Model of Cell Membrane — NEET Biology
📚 Practice ConceptAn improved model of the structure of cell membrane was proposed by Singer and Nicolson (1972) widely accepted as fluid mosaic model. According to this, the quasi-fluid nature of lipid enables lateral movement of proteins within the overall bilayer. This ability is more important for the functions of the membrane.
Which of the following statements regarding the plasma membrane and its transport mechanisms is NOT correct? S1: The fluid mosaic model describes the plasma membrane as a rigid, static structure with embedded proteins. S2: The plasma membrane is selectively permeable, regulating the passage of molecules across it. S3: Simple diffusion involves the movement of neutral solutes across the membrane along the concentration gradient, without energy expenditure. S4: Polar molecules require carrier proteins to facilitate their transport across the nonpolar lipid bilayer. S5: Active transport moves molecules from a region of higher concentration to lower concentration, utilizing ATP.
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