Question

The cell membranes of adjacent cells are fused at which of the following cell junction?

A

Macula adherens

B

Zonula adherens

C

Zonula occludens

D

Nexus

Hard

Solution

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Correct option is C)

Zonulae occludentes refers to tight junctions. Plasmalemma of two cells fuses to form impermeable or occluding junctions. For example, epithelial cells or capillaries and brain cells. Tight junctions are different in different tissues.
Macula adherens refers to desmosomes which are welded areas between adjacent cells having intercellular thickening materials, transmembrane linkers, disc-shaped intracellular thickening adjacent to each membrane with tonofibrils. 
Zonula adherens refers to terminal bars, i.e., desmosomes which lack tonofibrils and where discoid thickenings are replaced by bands of microfilaments and intermediate filaments.
Nexus is involved in intracellular adhesion and transport.
So, the correct answer is option C.

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