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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