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Solution


Q.

Identify the types of cell junctions that help to stop the leakage of substances across a tissue and facilitate communication with neighboring cells via rapid transfer of ions and molecules.         [2021]
1 Adhering junctions and gap junctions, respectively.  
2 Gap junctions and adhering junctions, respectively.  
3 Tight junctions and gap junctions, respectively.  
4 Adhering junctions and tight junctions, respectively.  

Ans.

(3)

Tight junctions help to stop substances from leaking across a tissue. Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules, and certain big molecules.