Extracellular matrix structural fibers serve as a hallmark of_______________?
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Answer: D. Fluid mosaic model of cell membrane
Explanation
The fluid mosaic model describes cell membranes as dynamic phospholipid bilayers with embedded proteins. Extracellular matrix interactions and structural fibers anchor to membrane proteins in this model. Structural components provide essential mechanical stability and support to the dynamic membrane. Singer and Nicolson proposed the fluid mosaic model to explain membrane structure in 1972. Membranes are flexible structures where lipids and proteins diffuse laterally across the surface. Glycoproteins and glycolipids extend outward to form cellular recognition sites on membranes.
Cell biology textbooks use this model to illustrate how cells communicate with their environment. Understanding membrane fluidity is crucial for developing targeted pharmaceutical drug delivery systems. Cell signaling pathways depend heavily on the mobility of components within the mosaic structure. Plant cell walls are rigid structures composed mainly of cellulose rather than fluid mosaics. Bacterial cell walls consist of peptidoglycan providing structural rigidity against osmotic pressure. Bacterial cell membranes share bilayer properties but lack the complex eukaryotic matrix attachments.
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