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?
A)The lymphocytes bind uniformly to the sections.
B)The lymphocytes bind to each other.
C)The lymphocytes selectively adhere to the endothelial lining.
D)The lymphocytes selectively adhere to antibodies for selectins.
E)The lymphocytes do not stick to the sections.

Question

Quizplus · Accepted Answer

The fact that the lymphocytes were isolated from the endothelial lining of lymph nodes suggests that they have a selective affinity for this tissue type. Additionally, the use of radioactive isotopes suggests that the binding of the lymphocytes to the tissue sections can be detected, indicating that they do indeed adhere to something. Since the tissue sections are from a lymphoid organ, it is likely that they contain endothelial lining similar to that found in lymph nodes. Therefore, it is probable that the lymphocytes selectively adhere to the endothelial lining of the tissue sections.

Lymphocytes Isolated from the Endothelial Lining of Lymph Nodes Are