INTRODUCTION TO MICROSCOPY CELL BIOLOGY
CELL JUNCTIONS
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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: -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-2: -The tight junction is an intracellular junctional structure that mediates adhesion between epithelial cells and is required for epithelial cell function.
Detailed explanation-3: -Tight junctions prevent the passage of molecules and ions through the space between plasma membranes of adjacent cells, so materials must actually enter the cells (by diffusion or active transport) in order to pass through the tissue.