You are asked to determine whether an unknown tissue specimen comes from a plant or an animal
Closer inspection with an electron microscope reveals that the cells are connected by
small openings lined by extensions of the cell membrane and containing tubules connecting
the endomembrane systems of adjacent cells. Which of the following conclusions can be
drawn from your observations?
A. The openings are plasmodesmata, so the
tissue must come from a plant.
B. The openings are plasmodesmata, so the
tissue must come from an animal.
C. The openings are gap junctions, so the
tissue must come from a plant.
D. The openings are gap junctions, so the
tissue must come from an animal.
E. The openings could be either gap junctions
or plasmodesmata, so it cannot be
determined whether the tissue came from a
plant or an animal.
A
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