Fthese 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.

Alright, i'm gonna try to explain this as good as possible. the law of conservation is like a collection overtime. it never changes though. no matter how you change the constituent parts.