F these cell junctions form a barrier to the passage of materials? which of these cell junctions form a barrier to the passage of materials? gap (communicating) junctions desmosomes (anchoring junctions) plasmodesmata keratin fibers tight junctions

The correct answer is 1, tight junctions. Tight junctions are the junctions seal adjacent epithelial cells in a narrow band just beneath their apical surface. They contain a network of claudins and other proteins. They limit the passage of molecules and ions through the space between cells.