Posted: July 24th, 2017

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?

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)