Question

question 106
0.25 pts
during their residence in the thymus, pre-t cells develop into _____, cells that proliferate as rapidly as any in the body.
options: cytotoxic t cells, antigen - presenting cells, thymocytes, memory t cells
question 107
0.25 pts
adaptive immunity, part of the body’s third line of defense, is orchestrated by two different classes of a type of white blood cell called the
options: leukocyte, macrophage, lymphocyte, phagocyte

Explanation:

Question 106

To solve this, we analyze each option:

• Cytotoxic T cells: These are a mature T - cell type, not the direct product of pre - T cells in the thymus during development.
• Antigen - presenting cells: These have a different function (presenting antigens) and are not the result of pre - T cell development in the thymus.
• Thymocytes: Pre - T cells, when in the thymus, develop into thymocytes. Thymocytes are known to proliferate rapidly.
• Memory T cells: These are formed after an immune response, not during the development of pre - T cells in the thymus.

Let's analyze each option:

• Leukocyte: This is a general term for white blood cells. Adaptive immunity is orchestrated by a specific type of white blood cell, not the general term.
• Macrophage: Macrophages are part of the innate immunity and are phagocytes, not the main cells for adaptive immunity.
• Lymphocyte: Adaptive immunity is orchestrated by two classes of lymphocytes (B and T cells).
• Phagocyte: Phagocytes are part of the innate immune system, not the main cells for adaptive immunity.

Answer:

C. thymocytes

Question 107