Immunology (Study Guide 2026/2027 -
Complete Questions with Verified Correct
Answers || 100% Guaranteed Pass - Newest
Version)
Since the source text was not included in your message, I built these 100 MCQs from the
standard Immunology syllabus covering innate immunity, adaptive immunity, antibodies,
antigens, MHC, cytokines, complement, hypersensitivity, autoimmunity, transplantation,
immunodeficiency, tumors, and vaccines.
1. Innate immunity: first-line defense
Keywords: innate immunity, barriers, first line, nonspecific
Question: Which of the following is the most immediate first-line defense of the body against
pathogens?
A. Plasma cells
B. Memory B cells
C. Skin and mucous membranes ✅✅✅
D. Cytotoxic T lymphocytes
2. Cells of innate immunity
Keywords: neutrophils, phagocytes, acute inflammation
Question: Which leukocyte is most abundant in blood and is a major phagocyte in acute
bacterial infection?
A. Eosinophil
B. Neutrophil ✅✅✅
C. Basophil
D. Plasma cell
3. Adaptive immunity specificity
Keywords: adaptive immunity, specificity, memory
Question: A key feature that distinguishes adaptive immunity from innate immunity is:
A. Presence in invertebrates
,B. Lack of specificity
C. Immunologic memory ✅✅✅
D. Immediate action without prior exposure
4. Primary lymphoid organs
Keywords: bone marrow, thymus, lymphoid organs
Question: Which pair correctly represents the primary lymphoid organs?
A. Spleen and lymph nodes
B. Bone marrow and thymus ✅✅✅
C. Tonsils and Peyer patches
D. Appendix and spleen
5. Secondary lymphoid organs
Keywords: lymph nodes, spleen, antigen encounter
Question: Antigen-dependent activation of mature lymphocytes mainly occurs in:
A. Bone marrow
B. Thymic cortex
C. Secondary lymphoid organs ✅✅✅
D. Liver sinusoids
6. Phagocytosis
Keywords: macrophage, engulfment, innate immunity
Question: The process by which neutrophils and macrophages ingest microbes is called:
A. Opsonization
B. Pinocytosis
C. Phagocytosis ✅✅✅
D. Degranulation
7. Opsonization
Keywords: opsonins, IgG, C3b, phagocytosis
Question: Opsonization primarily enhances:
A. Antibody mutation
, B. Phagocytosis of pathogens ✅✅✅
C. Platelet aggregation
D. Histamine release
8. Important opsonin
Keywords: complement, C3b, microbial coating
Question: Which complement fragment is the most important opsonin?
A. C2a
B. C3b ✅✅✅
C. C5a
D. C9
9. Fever mediator
Keywords: IL-1, TNF, pyrogens, inflammation
Question: Which cytokine is a major endogenous pyrogen that contributes to fever?
A. IL-4
B. IL-10
C. IL-1 ✅✅✅
D. IL-17
10. Acute-phase response
Keywords: IL-6, liver, acute-phase proteins
Question: The cytokine most strongly associated with induction of acute-phase proteins by the
liver is:
A. IL-2
B. IL-6 ✅✅✅
C. IL-5
D. IFN-beta
11. Natural killer cells
Keywords: NK cells, innate immunity, virus-infected cells
Question: Natural killer cells are particularly important for killing:
Complete Questions with Verified Correct
Answers || 100% Guaranteed Pass - Newest
Version)
Since the source text was not included in your message, I built these 100 MCQs from the
standard Immunology syllabus covering innate immunity, adaptive immunity, antibodies,
antigens, MHC, cytokines, complement, hypersensitivity, autoimmunity, transplantation,
immunodeficiency, tumors, and vaccines.
1. Innate immunity: first-line defense
Keywords: innate immunity, barriers, first line, nonspecific
Question: Which of the following is the most immediate first-line defense of the body against
pathogens?
A. Plasma cells
B. Memory B cells
C. Skin and mucous membranes ✅✅✅
D. Cytotoxic T lymphocytes
2. Cells of innate immunity
Keywords: neutrophils, phagocytes, acute inflammation
Question: Which leukocyte is most abundant in blood and is a major phagocyte in acute
bacterial infection?
A. Eosinophil
B. Neutrophil ✅✅✅
C. Basophil
D. Plasma cell
3. Adaptive immunity specificity
Keywords: adaptive immunity, specificity, memory
Question: A key feature that distinguishes adaptive immunity from innate immunity is:
A. Presence in invertebrates
,B. Lack of specificity
C. Immunologic memory ✅✅✅
D. Immediate action without prior exposure
4. Primary lymphoid organs
Keywords: bone marrow, thymus, lymphoid organs
Question: Which pair correctly represents the primary lymphoid organs?
A. Spleen and lymph nodes
B. Bone marrow and thymus ✅✅✅
C. Tonsils and Peyer patches
D. Appendix and spleen
5. Secondary lymphoid organs
Keywords: lymph nodes, spleen, antigen encounter
Question: Antigen-dependent activation of mature lymphocytes mainly occurs in:
A. Bone marrow
B. Thymic cortex
C. Secondary lymphoid organs ✅✅✅
D. Liver sinusoids
6. Phagocytosis
Keywords: macrophage, engulfment, innate immunity
Question: The process by which neutrophils and macrophages ingest microbes is called:
A. Opsonization
B. Pinocytosis
C. Phagocytosis ✅✅✅
D. Degranulation
7. Opsonization
Keywords: opsonins, IgG, C3b, phagocytosis
Question: Opsonization primarily enhances:
A. Antibody mutation
, B. Phagocytosis of pathogens ✅✅✅
C. Platelet aggregation
D. Histamine release
8. Important opsonin
Keywords: complement, C3b, microbial coating
Question: Which complement fragment is the most important opsonin?
A. C2a
B. C3b ✅✅✅
C. C5a
D. C9
9. Fever mediator
Keywords: IL-1, TNF, pyrogens, inflammation
Question: Which cytokine is a major endogenous pyrogen that contributes to fever?
A. IL-4
B. IL-10
C. IL-1 ✅✅✅
D. IL-17
10. Acute-phase response
Keywords: IL-6, liver, acute-phase proteins
Question: The cytokine most strongly associated with induction of acute-phase proteins by the
liver is:
A. IL-2
B. IL-6 ✅✅✅
C. IL-5
D. IFN-beta
11. Natural killer cells
Keywords: NK cells, innate immunity, virus-infected cells
Question: Natural killer cells are particularly important for killing:
