1. What is the primary role of regulatory T cells?
A. To kill infected cells
B. To activate B cells
C. To suppress excessive immune responses
D. To produce cytokines
Answer: c) To suppress excessive immune responses
Rationale: Regulatory T cells (Tregs) help maintain immune
tolerance and prevent autoimmune diseases by suppressing
excessive immune activity.
2. What type of immunity is provided by the transfer of antibodies
from one individual to another?
A. Active immunity
B. Passive immunity
C. Innate immunity
D. Artificial immunity
Answer: b) Passive immunity
Rationale: Passive immunity occurs when antibodies are
transferred from one individual to another, providing temporary
protection.
,3. Which of the following is an example of a T-independent
antigen?
A. Protein from a virus
B. Lipopolysaccharide from bacteria
C. Carbohydrates from bacteria
D. DNA from a pathogen
Answer: b) Lipopolysaccharide from bacteria
Rationale: T-independent antigens, such as lipopolysaccharides,
do not require T cell help for B cell activation and antibody
production.
4. Which of the following best describes the role of neutrophils?
A. Antigen presentation
B. Phagocytosis of pathogens
C. Production of antibodies
D. Activation of helper T cells
Answer: b) Phagocytosis of pathogens
Rationale: Neutrophils are the first responders to infection and are
involved in the phagocytosis and destruction of pathogens.
5. Which of the following is an example of artificial active
immunity?
A. Immunization with a vaccine
, B. Passing of antibodies through the placenta
C. Natural infection with a pathogen
D. Transfer of antibodies from mother to child via breast milk
Answer: a) Immunization with a vaccine
Rationale: Artificial active immunity is obtained through
vaccination, where the immune system is exposed to a non-
virulent form of a pathogen, triggering an immune response.
6. What is the role of natural killer (NK) cells in the immune
system?
A. To produce antibodies
B. To directly destroy infected or cancerous cells
C. To present antigens to T cells
D. To produce cytokines
Answer: b) To directly destroy infected or cancerous cells
Rationale: NK cells play a critical role in recognizing and killing
infected or cancerous cells without the need for antigen
presentation.
7. Which type of immunity is provided by vaccination?
A. Innate immunity
B. Active acquired immunity
C. Passive acquired immunity
A. To kill infected cells
B. To activate B cells
C. To suppress excessive immune responses
D. To produce cytokines
Answer: c) To suppress excessive immune responses
Rationale: Regulatory T cells (Tregs) help maintain immune
tolerance and prevent autoimmune diseases by suppressing
excessive immune activity.
2. What type of immunity is provided by the transfer of antibodies
from one individual to another?
A. Active immunity
B. Passive immunity
C. Innate immunity
D. Artificial immunity
Answer: b) Passive immunity
Rationale: Passive immunity occurs when antibodies are
transferred from one individual to another, providing temporary
protection.
,3. Which of the following is an example of a T-independent
antigen?
A. Protein from a virus
B. Lipopolysaccharide from bacteria
C. Carbohydrates from bacteria
D. DNA from a pathogen
Answer: b) Lipopolysaccharide from bacteria
Rationale: T-independent antigens, such as lipopolysaccharides,
do not require T cell help for B cell activation and antibody
production.
4. Which of the following best describes the role of neutrophils?
A. Antigen presentation
B. Phagocytosis of pathogens
C. Production of antibodies
D. Activation of helper T cells
Answer: b) Phagocytosis of pathogens
Rationale: Neutrophils are the first responders to infection and are
involved in the phagocytosis and destruction of pathogens.
5. Which of the following is an example of artificial active
immunity?
A. Immunization with a vaccine
, B. Passing of antibodies through the placenta
C. Natural infection with a pathogen
D. Transfer of antibodies from mother to child via breast milk
Answer: a) Immunization with a vaccine
Rationale: Artificial active immunity is obtained through
vaccination, where the immune system is exposed to a non-
virulent form of a pathogen, triggering an immune response.
6. What is the role of natural killer (NK) cells in the immune
system?
A. To produce antibodies
B. To directly destroy infected or cancerous cells
C. To present antigens to T cells
D. To produce cytokines
Answer: b) To directly destroy infected or cancerous cells
Rationale: NK cells play a critical role in recognizing and killing
infected or cancerous cells without the need for antigen
presentation.
7. Which type of immunity is provided by vaccination?
A. Innate immunity
B. Active acquired immunity
C. Passive acquired immunity
