1. Which class of immunoglobulins is predominantly found in
mucosal areas such as the respiratory and gastrointestinal tracts?
A. IgM
B. IgE
C. IgA
D. IgG
Answer: c) IgA
Rationale: IgA is found in mucosal areas like the respiratory and
gastrointestinal tracts, where it plays a crucial role in mucosal
immunity by preventing pathogen entry.
2. What is the first line of defense in the immune system?
A. T cells
B. Antibodies
C. Physical and chemical barriers
D. Phagocytes
Answer: c) Physical and chemical barriers
Rationale: The first line of defense includes physical and chemical
barriers like the skin, mucous membranes, and stomach acid that
prevent pathogens from entering the body.
,3. What is the result of an antibody-mediated immune response?
A. Destruction of infected cells by cytotoxic T cells
B. Neutralization of pathogens and removal of foreign substances
C. Activation of the complement system to kill pathogens
D. Induction of cell apoptosis
Answer: b) Neutralization of pathogens and removal of foreign
substances
Rationale: Antibodies neutralize pathogens by binding to them,
preventing infection, and facilitating their removal by phagocytes.
4. Which antibody is the first to be produced during an immune
response?
A. IgA
B. IgE
C. IgM
D. IgG
Answer: c) IgM
Rationale: IgM is the first antibody produced in response to an
infection, providing initial defense before the immune system
shifts to producing IgG for long-term protection.
5. What is the role of helper T cells in the immune response?
A. To produce antibodies
, B. To activate B cells and cytotoxic T cells
C. To destroy pathogens directly
D. To regulate blood pressure
Answer: b) To activate B cells and cytotoxic T cells
Rationale: Helper T cells assist in the immune response by
activating both B cells (for antibody production) and cytotoxic T
cells (for killing infected cells).
6. Which of the following best describes the concept of
immunological tolerance?
A. The immune system targets foreign cells
B. The immune system attacks the body’s own tissues
C. The immune system recognizes and accepts self-cells as non-
threatening
D. The immune system produces antibodies against all foreign
substances
Answer: c) The immune system recognizes and accepts self-cells as
non-threatening
Rationale: Immunological tolerance is the process by which the
immune system does not attack the body’s own cells, avoiding
autoimmune reactions.
7. Which of the following is an example of a passive artificial
immunity?
mucosal areas such as the respiratory and gastrointestinal tracts?
A. IgM
B. IgE
C. IgA
D. IgG
Answer: c) IgA
Rationale: IgA is found in mucosal areas like the respiratory and
gastrointestinal tracts, where it plays a crucial role in mucosal
immunity by preventing pathogen entry.
2. What is the first line of defense in the immune system?
A. T cells
B. Antibodies
C. Physical and chemical barriers
D. Phagocytes
Answer: c) Physical and chemical barriers
Rationale: The first line of defense includes physical and chemical
barriers like the skin, mucous membranes, and stomach acid that
prevent pathogens from entering the body.
,3. What is the result of an antibody-mediated immune response?
A. Destruction of infected cells by cytotoxic T cells
B. Neutralization of pathogens and removal of foreign substances
C. Activation of the complement system to kill pathogens
D. Induction of cell apoptosis
Answer: b) Neutralization of pathogens and removal of foreign
substances
Rationale: Antibodies neutralize pathogens by binding to them,
preventing infection, and facilitating their removal by phagocytes.
4. Which antibody is the first to be produced during an immune
response?
A. IgA
B. IgE
C. IgM
D. IgG
Answer: c) IgM
Rationale: IgM is the first antibody produced in response to an
infection, providing initial defense before the immune system
shifts to producing IgG for long-term protection.
5. What is the role of helper T cells in the immune response?
A. To produce antibodies
, B. To activate B cells and cytotoxic T cells
C. To destroy pathogens directly
D. To regulate blood pressure
Answer: b) To activate B cells and cytotoxic T cells
Rationale: Helper T cells assist in the immune response by
activating both B cells (for antibody production) and cytotoxic T
cells (for killing infected cells).
6. Which of the following best describes the concept of
immunological tolerance?
A. The immune system targets foreign cells
B. The immune system attacks the body’s own tissues
C. The immune system recognizes and accepts self-cells as non-
threatening
D. The immune system produces antibodies against all foreign
substances
Answer: c) The immune system recognizes and accepts self-cells as
non-threatening
Rationale: Immunological tolerance is the process by which the
immune system does not attack the body’s own cells, avoiding
autoimmune reactions.
7. Which of the following is an example of a passive artificial
immunity?
