NEET BIOLOGY

Detailed explanation-1: -Adherens junctions and desmosomes hold cells together and are formed by transmembrane adhesion proteins that belong to the cadherin family.

Detailed explanation-2: -Explanation: The cell junctions called tight, adhering and gap junctions are found in Epithelial tissue. These are widespread throughout the body and form the covering of all body surfaces, cavities and hollow organs.

Detailed explanation-3: -Epithelial cells are held together by strong anchoring (zonula adherens) junctions. The adherens junction lies below the tight junction (occluding junction). In the gap (about 15-20nm) between the two cells, there is a protein called cadherin-a cell membrane glycoprotein.

Detailed explanation-4: -The molecules responsible for creating cell junctions include various cell adhesion molecules. There are four main types: selectins, cadherins, integrins, and the immunoglobulin superfamily. Selectins are cell adhesion molecules that play an important role in the initiation of inflammatory processes.