Welcome to the Immune & System MDCAT MCQs with Answers. In this post, we have shared Immune & System Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Immune & System MCQs in this MDCAT Online Test.
Which type of immunity is provided by antibodies produced by B cells?
a) Innate immunity
b) Passive immunity
c) Active immunity
d) Adaptive immunity
What is the primary function of T lymphocytes in the immune system?
a) To produce antibodies
b) To directly kill infected cells
c) To secrete cytokines
d) To recognize and neutralize pathogens
Which organ is considered the primary lymphoid organ where T cells mature?
a) Spleen
b) Bone marrow
c) Thymus
d) Lymph nodes
What type of white blood cells are primarily involved in allergic reactions?
a) Neutrophils
b) Eosinophils
c) Basophils
d) Monocytes
Which immune system component is responsible for identifying and destroying pathogens?
a) Platelets
b) Red blood cells
c) White blood cells
d) Plasma cells
What is the role of macrophages in the immune system?
a) To produce antibodies
b) To present antigens to T cells
c) To directly kill pathogens
d) To produce cytokines
Which type of immune response involves the production of antibodies?
a) Cell-mediated immunity
b) Humoral immunity
c) Inflammatory response
d) Natural immunity
Which cells are responsible for the initial recognition of pathogens?
a) B cells
b) T cells
c) Macrophages
d) Dendritic cells
Which type of immunity is acquired through vaccination?
a) Natural passive immunity
b) Artificial active immunity
c) Natural active immunity
d) Artificial passive immunity
What is the function of the spleen in the immune system?
a) To produce red blood cells
b) To filter blood and remove old cells
c) To produce hormones
d) To store lymph
Which type of lymphocyte is responsible for the production of antibodies?
a) T cells
b) B cells
c) Natural killer cells
d) Helper T cells
What is the function of the lymphatic system?
a) To produce hormones
b) To transport oxygen
c) To transport lymph and help in immune response
d) To digest food
Which protein is involved in the defense against viral infections?
a) Hemoglobin
b) Collagen
c) Interferon
d) Insulin
Which type of immunity involves the transfer of antibodies from another individual?
a) Active immunity
b) Passive immunity
c) Natural immunity
d) Adaptive immunity
What is the primary role of neutrophils in the immune response?
a) To produce antibodies
b) To directly kill bacteria and fungi
c) To present antigens
d) To regulate the immune response
Which of the following is NOT a component of the innate immune system?
a) Skin
b) Phagocytes
c) Antibodies
d) Complement system
What is the role of helper T cells in the immune system?
a) To kill infected cells directly
b) To produce antibodies
c) To activate other immune cells
d) To suppress immune responses
Which type of antigen-presenting cell is most effective in activating T cells?
a) Macrophages
b) B cells
c) Dendritic cells
d) Neutrophils
What is the role of the complement system in the immune response?
a) To produce antibodies
b) To enhance the ability of antibodies and phagocytes to clear pathogens
c) To activate T cells
d) To neutralize toxins
Which type of immune cell is known for its ability to recognize and kill cancer cells?
a) B cells
b) T cells
c) Natural killer cells
d) Macrophages
What type of immunity is achieved through exposure to a disease-causing microorganism?
a) Artificial passive immunity
b) Natural passive immunity
c) Artificial active immunity
d) Natural active immunity
Which type of vaccine contains weakened or inactivated pathogens?
a) Subunit vaccine
b) Inactivated vaccine
c) mRNA vaccine
d) Toxoid vaccine
What is the primary function of regulatory T cells?
a) To kill infected cells
b) To help B cells produce antibodies
c) To suppress excessive immune responses
d) To present antigens
Which type of immune response is characterized by a quick and strong reaction upon subsequent exposure to the same antigen?
a) Primary immune response
b) Secondary immune response
c) Tertiary immune response
d) Initial immune response
Which of the following is a function of the bone marrow in the immune system?
a) To mature T cells
b) To produce white blood cells
c) To filter blood
d) To produce antibodies
What is the purpose of a booster vaccine?
a) To cure an existing infection
b) To provide immunity against multiple diseases
c) To enhance and prolong immunity from a previous vaccination
d) To replace lost antibodies
Which molecule on the surface of pathogens is recognized by the immune system?
a) Antibody
b) Antigen
c) Cytokine
d) Hormone
Which of the following is an example of an autoimmune disease?
a) Influenza
b) Tuberculosis
c) Rheumatoid arthritis
d) Malaria
What is the main function of antibodies in the immune response?
a) To directly kill pathogens
b) To neutralize toxins and pathogens
c) To present antigens
d) To produce cytokines
Which type of cell is primarily involved in the destruction of infected or cancerous cells?
a) Helper T cells
b) B cells
c) Cytotoxic T cells
d) Memory B cells
Which part of the immune system includes the lymph nodes and spleen?
a) Primary lymphoid organs
b) Secondary lymphoid organs
c) Tertiary lymphoid organs
d) Immune effector sites
What type of immunity is conferred by maternal antibodies transferred through the placenta or breast milk?
a) Natural active immunity
b) Artificial active immunity
c) Natural passive immunity
d) Artificial passive immunity
Which immune cells are responsible for the destruction of pathogens through phagocytosis?
a) Eosinophils
b) Neutrophils
c) Basophils
d) B cells
What is the primary role of plasma cells in the immune response?
a) To present antigens
b) To secrete antibodies
c) To activate T cells
d) To suppress immune responses
Which of the following is NOT a characteristic of the adaptive immune system?
a) Specificity
b) Memory
c) Rapid response
d) Diversity
What is the main function of the thymus gland?
a) To produce antibodies
b) To mature T lymphocytes
c) To filter blood
d) To produce bile
What type of immunity is acquired through the injection of immune globulins?
a) Natural active immunity
b) Artificial passive immunity
c) Natural passive immunity
d) Artificial active immunity
Which cells are known for their role in presenting antigens to T cells?
a) Neutrophils
b) B cells
c) Macrophages
d) Eosinophils
What role do cytokines play in the immune system?
a) They directly kill pathogens
b) They produce antibodies
c) They facilitate communication between immune cells
d) They neutralize toxins
Which immune cells are primarily involved in the initial response to an infection?
a) Memory cells
b) Helper T cells
c) Neutrophils
d) Cytotoxic T cells
What is the primary role of memory B cells?
a) To produce antibodies during the initial response
b) To remember and respond to previously encountered antigens
c) To kill infected cells
d) To present antigens to T cells
Which of the following is a common autoimmune disorder affecting the thyroid gland?
a) Type 1 diabetes
b) Rheumatoid arthritis
c) Graves’ disease
d) Multiple sclerosis
Which type of vaccine uses a small, harmless piece of the pathogen to stimulate an immune response?
a) Inactivated vaccine
b) Subunit vaccine
c) Live attenuated vaccine
d) mRNA vaccine
What is the main function of the lymphatic system in relation to immune function?
a) To digest food
b) To transport and filter lymph
c) To produce hormones
d) To store red blood cells
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