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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A type of inter-cellular connection in which the outermost portions of the two cell membranes have a tight seal together is termed a(n)
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tight junction
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intermediate junction
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gap junction
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desmosome
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Explanation:
Detailed explanation-1: -This type of junction is also called zonula occludens and is the most apical structure in the epithelial cell. Zonula occludens describes, that there is a formed band of tight junctions which encircles every cell. The main tight junction forms a seal between the two membranes.
Detailed explanation-2: -Different types of intercellular junctions, including plasmodesmata, tight junctions, gap junctions, and desmosomes.
Detailed explanation-3: -Gap junctions: Transmembrane proteins called connexins form channels for small molecules to move between the cytoplasms of neighboring cells. Hemidesmosomes: Integrins (see Fig.
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