ATI RN
Immune System Exam Questions Questions
Question 1 of 4
Identify the class of antibody that is formed first in a new infection.
Correct Answer: D
Rationale: IgM is the first antibody produced in a primary response.
Question 2 of 4
The class I major histocompatibility complex (MHC)
Correct Answer: D
Rationale: MHC I has HLA-A, B, C loci; it's on nucleated cells , chromosome 6 , and highly polymorphic .
Question 3 of 4
Which of the following cells plays a central role in the development of an immune response?
Correct Answer: D
Rationale: T-helper cells coordinate immunity; macrophages present antigens, neutrophils fight infection, and T-cytotoxic kill cells.
Question 4 of 4
In order for the B cells to secrete antibody efficiently, they need to be stimulated by T cells. The process in the thymus whereby these CD4+ T cells are saved from apoptosis and go on to the next step in differentiation is:
Correct Answer: A
Rationale: Positive selection saves useful T cells; negative deletes self-reactive, clonal selection is antigen-driven.