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 q on cell junction? help  




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Author3 Posts
  #1

q-Several contiguous cells are labeled with a
fluorescent dye that cannot cross cell
membranes. One cell is experimentally bleached
with light that destroys the dye, but the cell soon
recovers dye fluorescence. This recovery is best
explained by the presence of which of the
following structures between the bleached cell
and its fluorescent neighbors?
(A) A basal lamina
(B) Desmosomes (maculae adherentes)
(C) Gap junctions
(D) Glycosaminoglycans
(E) Tight junctions (zonulae occludentes)

Can somebody explain me the answer to this question?
can some1 explain me briefly these junctions?





  #2

its C

gap junction (or nexus) which appears in plaques and mediates flow of current betwwen cells through connexon that is protein molecules arranged in hexameres passing through both cell membranes.Therefore dye flows back into the cell from adjacent cells and fluoresence is recovered. Imagine the gap juntion as a tube connecting two barrels.


  #3

simply,,all ABDE are points of contacts bet. cells with out opening
only C is contact point bet. cells with opening





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