Question

36. Which of the following make contact with antigens during an immune response?

1. Antibodies (immunoglobulins)
2. Major histocompatibility complex (MHC) proteins
3. T cell receptors (TCRs)
4. All of the above
5. A and C

37. What process describes elimination of those immune system cells which have developed a specificity for self molecules?

1. Clonal deletion
2. Clonal expansion
3. Granzymation
4. Reversion
5. None of the above

38. The Complement System is ……..

1. A means of chemical signaling between cytotoxic T cells.
2. A friendly greeting used between fellow immunologists.
3. A set of proteins that activates natural killer cells.
4. A set of proteins that activates cytotoxic T cells.
5. A set of proteins that leads to lysis of a pathogen.

39. Complement proteins attach to the cell surface of the pathogen when …….

1. An interaction occurs between an antibody and an antigen.
2. Interleukins are released by natural killer cells.
3. Phagocytosis is inactivated.
4. All of the above
5. A and B

Answer 1

Answer 36:

Antigens can be defined as foreign particles that induce an immune response, which involves various cells and molecules. The antigens are bound by MHC proteins, and are recognised by T-cell receptors. Antibodies are the final molecules that fight against antigens and neutralize them. Thus, the correct choice should be:

(D) All of the above.

Answer 37:

During maturation, B and T cells undergo a selection process. Those B cells or T cells which can induce immune response against the proteins of body itself, are eliminated. This process of removing cells that can harm the cells of body itself is called clonal deletion.

(A) Clonal deletion.