Question

Which of these cell junctions form a barrier to the passage of materials? a) Plasmodesmata b) Desmosomes (anchoring junctions) c) Keratin fibers d) Gap (communicating) junctions e) Tight junctions

Answer 1

Answer: E) tight junctions

Step-by-step explanation:

Tight joints act as barriers that regulate the circulation of water and solutes between the epithelial layers. Tight junctions are classified as a paracellular barrier, which is defined as having no directional discrimination, but movement is largely dependent on solute size and load.