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MCAT Question A Day - 6/4/14 - Answer!

Which of the following statements IS true concerning tight junctions?

I.  They connect adjacent cells.
II.  They may form a barrier to extracellular fluids.
III.  They have the greatest strength of all cellular adheSIOns.

A.  I only
B.  I and II only
C.  II and III only
D.  I, II, and III

B is correct. I and II are true, but desmosomes are anchored to the cytoskeleton and are stronger than tight junctions.

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