EPITHELIUM
CELL JUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the space between cells are closer together than they normally should be
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A chemical reaction
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A specialized connection of two adjacent animal cell membranes that prevents substances from passing through
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None of the above
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Detailed explanation-1: -Tight Junctions: The outer layer of adjacent cells fuse and do not allow the materials to pass through. They act as a barrier. These are formed between epithelial cells. Gap Junctions: These are intercellular channels formed between adjacent cells.
Detailed explanation-2: -A tight junction is a watertight seal between two adjacent animal cells, which prevents materials from leaking out of cells. Desmosomes connect adjacent cells when cadherins in the plasma membrane connect to intermediate filaments.
Detailed explanation-3: -Tight junctions, also known as Zonula Occludens, are cell-cell adhesion complexes that play a role in the organization of epithelial tissue.
Detailed explanation-4: -Instead, tight junctions create a watertight seal between two adjacent animal cells. At the site of a tight junction, cells are held tightly against each other by many individual groups of tight junction proteins called claudins, each of which interacts with a partner group on the opposite cell membrane.
Detailed explanation-5: -Gap junctions in animal cells are like plasmodesmata in plant cells in that they are channels between adjacent cells that allow for the transport of ions, nutrients, and other substances that enable cells to communicate ([link]). Structurally, however, gap junctions and plasmodesmata differ.