Exam 7: Interactions Between Cells and Their Environment

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Lymphocytes isolated from the endothelial lining of lymph nodes are labeled with radioactive isotopes. They are then exposed to frozen tissue sections of a lymphoid organ. What happens?

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The cells of the epiblast of a developing mammalian embryo display cell adhesion molecules on their surfaces that presumably promote their close association with one another. What are these molecules termed?

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What forms the barrier of the tight junctions that seals off the space between adjacent cells?

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