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Amino Acids

How is tight ...

Question

How is tight junction is formed between neighbouring cells??

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Solution

Bicellular tight junctions, found between the lateral membrane surfaces of two adjacent cells, are primarily formed by claudin strands.Claudin molecules in the two chains interact with each other via their extracellular palms

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Q. Assertion: Gap junctions perform cementing function to keep the neighbouring cells together.

Reason: Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.

Column I	Column II
A. Tight junctions	i. Cement neighbouring cells together to form a sheet
B. Adhering junctions	ii. Extracellular matrix supporting the epithelial cells
C. Gap junction	iii. Establish a barrier to prevent leakage of fluid across epithelial cells
D. Basement membrane	iv. Cytoplasmic channels to facilitate to communication between adjacent cells

Q. Select the correct option:

Which of the following statements about cell junctions are correct?
(i) All the cells of the epithelium are held together with little intercellular materials
(ii) In almost all animal tissues specialised junctions provide both structural and functional link between its individual cells
(iii) Tight junctions prevent substances from leaking across a tissue
(iv) Adhering junctions provide cementing to keep neighbouring cells together.
(v) Gap junctions provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.

Q. Just like humans communicate with one another, the cells interact with the neighbouring cells. This type of communication between cells is facilitated by a type of cell junction known as

The cell junctions namely tight, adhering and gap junctions are found in ______________.

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