Cell Junctions

Part A

Which of these cell junctions form a barrier to the passage of materials?

	gap (communicating) junctions
	desmosomes (anchoring junctions)
	keratin fibers
	tight junctions
	plasmodesmata

Correct

Tight junctions form a barrier that prevents fluids from moving between cells.

Part B

The primary role of _____ is to bind animal cells together.

	the cytoskeleton
	plasmodesmata
	gap (communicating) junctions
	tight junctions
	desmosomes

Correct

The primary role of desmosomes (anchoring junctions) is to bind cells together.

Part C

_____ aid in the coordination of the activities of adjacent animal cells.

	Gap (communicating) junctions
	Desmosomes
	Keratin fibers
	Tight junctions
	Plasmodesmata

Correct

Gap junctions allow for the passage of material between cells, thus facilitating communication between these cells.