generate high yield mcqs for batterjee medical college exams jeddah i have less time to revise so make sure to generate mcqs most likely to come

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🧠 High-Yield MCQs — BMC Immunology (L3, L4, L5)

📘 LECTURE 3: Humoral Immunity

Q1. A substance that can bind to an antibody but cannot elicit an immune response on its own is called a:

A) Immunogen
B) Adjuvant
C) Hapten ✅
D) Epitope
E) Paratope

Explanation: Haptens are low-molecular-weight compounds that bind antibodies but are not immunogenic alone. They become immunogenic when conjugated to a carrier protein.

Q2. Which enzyme cleaves an immunoglobulin molecule into two Fab fragments and one Fc fragment?

A) Pepsin
B) Trypsin
C) Papain ✅
D) Collagenase
E) Elastase

Explanation: Papain cleaves IgG into 2 Fab (antigen-binding) + 1 Fc (crystallizable) fragments.

Q3. Which immunoglobulin heavy chain corresponds to IgE?

A) Alpha
B) Delta
C) Gamma
D) Mu
E) Epsilon ✅

Explanation: Epsilon (ε) heavy chains → IgE; Gamma → IgG; Alpha → IgA; Mu → IgM; Delta → IgD.

Q4. Which immunoglobulins can activate the classical complement pathway? (Select the BEST answer)

A) IgA and IgE
B) IgG and IgM ✅
C) IgM and IgD
D) IgE and IgG
E) All immunoglobulins equally

Explanation: Only IgG and IgM activate the classical complement pathway. IgM is far more efficient than IgG.

Q5. A mother is breastfeeding her newborn. A doctor explains that the baby is protected from GI pathogens through the mother's milk. Which antibody is primarily responsible?

A) IgG
B) IgM
C) IgD
D) IgA ✅
E) IgE

Explanation: Secretory IgA is present in breast milk and protects mucosal surfaces by preventing attachment of microorganisms. (This is the exact case scenario in Lecture 3.)

Q6. Which of the following BEST describes the primary antibody response compared to the secondary response?

A) Shorter lag phase, predominantly IgG
B) Longer lag phase (7–10 days), predominantly IgM ✅
C) Shorter lag phase, higher antibody titers
D) Longer lag phase, predominantly IgE
E) No difference between primary and secondary

Explanation: Primary response: long lag phase (~7–10 days), mainly IgM. Secondary response: short lag phase (~3–5 days), mainly IgG, higher titer, affinity maturation.

Q7. IgG antibodies promote phagocytosis of microbes by binding to Fc receptors on phagocytes. This mechanism is called:

A) Neutralization
B) ADCC
C) Complement activation
D) Opsonization ✅
E) Degranulation

Q8. Which cell type mediates Antibody-Dependent Cellular Cytotoxicity (ADCC) primarily against IgG-coated targets?

A) Eosinophils
B) Mast cells
C) Neutrophils
D) Natural Killer (NK) cells ✅
E) Basophils

Explanation: NK cells express Fcγ receptors and kill IgG-coated targets via ADCC. Eosinophils use IgE to kill helminths.

Q9. The neonatal Fc receptor (FcRn) transports which antibody across the placenta from mother to fetus?

A) IgA
B) IgM
C) IgG ✅
D) IgE
E) IgD

Q10. Which type of antigen activates B cells WITHOUT T cell help?

A) Proteins
B) Glycoproteins
C) Viral capsid proteins
D) Polysaccharides ✅
E) Lipoproteins

Explanation: T-cell independent (TI) antigens = polysaccharides. T-cell dependent (TD) antigens = proteins.

📙 LECTURE 4: Cell-Mediated Immunity

Q11. Cell-mediated immunity can be transferred to a naïve individual using:

A) Serum
B) Plasma
C) T lymphocytes ✅
D) B lymphocytes
E) Immunoglobulins

Explanation: CMI is defined as immunity transferred by sensitized T cells, NOT by serum or antibodies.

Q12. Passive immunity differs from active immunity in that it:

A) Lasts for years
B) Requires T cell activation
C) Has slow onset
D) Provides immediate protection but short duration ✅
E) Produces memory cells

Explanation: Passive immunity = immediate availability (preformed antibodies), but short duration (months). Active immunity = slow onset, long duration (years).

Q13. A patient develops pulmonary tuberculosis. Biopsy shows granuloma formation. Which T helper subset is primarily responsible for this lesion?

A) Th2
B) Th17
C) Treg
D) Th1 ✅
E) Tfh

Explanation: Th1 cells secrete IFN-γ → activates macrophages → granuloma formation against intracellular pathogens like M. tuberculosis. (This is the exact case scenario in Lecture 4.)

Q14. A child presents with recurrent asthma and elevated serum IgE. Which Th2 cytokine is responsible for the increased IgE production?

A) IL-5
B) IL-13
C) IFN-γ
D) IL-4 ✅
E) IL-17

Explanation: IL-4 → drives Th2 differentiation AND increases IgE production → allergic disease/asthma.

Q15. IL-5 from Th2 cells primarily:

A) Recruits neutrophils
B) Increases mucus secretion
C) Activates and proliferates eosinophils ✅
D) Induces IgE switching
E) Inhibits T cell activation

Q16. Which cytokine is the main T-cell growth factor produced after T helper cell activation?

A) IL-4
B) IFN-γ
C) TNF
D) IL-2 ✅
E) IL-12

Explanation: IL-2 = T-cell growth factor. Activated T cells produce IL-2 and express high-affinity IL-2 receptors (autocrine growth) → clonal expansion.

Q17. Cytotoxic T cells (CD8+) kill target cells by releasing cytoplasmic granules. Which molecule creates pores in the target cell membrane?

A) Granzyme
B) FAS-Ligand
C) Caspase
D) Perforin ✅
E) TNF-α

Explanation: Perforin creates holes → Granzymes enter through those holes → initiate apoptosis. FAS-L/FAS interaction is a separate apoptosis pathway also used by Tc cells.

Q18. Regulatory T cells (Treg) suppress immune responses by producing which cytokines?

A) IL-2 and IFN-γ
B) IL-4 and IL-5
C) IL-10 and TGF-β ✅
D) IL-17 and IL-22
E) IL-1 and TNF

Q19. Staphylococcal toxic shock syndrome toxin acts as a superantigen. What is its mechanism?

A) Binds within the MHC peptide groove normally
B) Activates only CD8+ T cells
C) Inhibits cytokine release
D) Cross-links MHC Class II directly to TCR, activating large numbers of T cells ✅
E) Blocks CD28 costimulation

Explanation: Superantigens bypass normal antigen processing → massive cytokine storm (IL-2, IL-1, TNF) → Toxic Shock Syndrome.

Q20. IL-12, produced by macrophages, primarily drives differentiation of:

A) Th2 cells
B) Th17 cells
C) Th1 cells ✅
D) Treg cells
E) Tfh cells

📗 LECTURE 5: MHC & Lymphocyte Activation

Q21. MHC molecules are encoded on which chromosome?

A) Chromosome 1
B) Chromosome 14
C) Chromosome 6 ✅
D) Chromosome 9
E) Chromosome 22

Q22. Which HLA antigen is strongly associated with ankylosing spondylitis?

A) HLA-DR4
B) HLA-DR2
C) HLA-DR5
D) HLA-B27 ✅
E) HLA-C

Tip: Remember: B27 = ankylosing spondylitis, DR4 = rheumatoid arthritis, DR2 = multiple sclerosis, DR5 = Hashimoto's.

Q23. MHC Class I molecules present antigens to:

A) CD4+ T helper cells
B) B cells
C) NK cells
D) CD8+ cytotoxic T cells ✅
E) Macrophages

Explanation: MHC-I presents endogenous (intracellular) antigens (viruses, tumors) to CD8+ T cells. MHC-II presents exogenous antigens to CD4+ T cells.

Q24. Which cells express MHC Class II molecules?

A) All nucleated cells
B) Platelets and RBCs
C) Professional APCs: dendritic cells, macrophages, B cells ✅
D) All cells including RBCs
E) Only T cells

Q25. MHC Class I structure consists of:

A) Two polymorphic α and β chains
B) One α chain + one IgG molecule
C) One long α chain + β2-microglobulin ✅
D) Two identical α chains
E) α and β chains, both encoded in HLA locus

Explanation: MHC-I = 1 HLA-encoded α chain + β2-microglobulin. MHC-II = 2 HLA-encoded chains (α and β, both polymorphic).

Q26. The FIRST signal for T cell activation is:

A) CD28 binding to B7
B) IL-2 receptor engagement
C) CD40L binding to CD40
D) TCR binding to peptide-MHC complex ✅
E) CTLA-4 binding to B7

Q27. Which molecule on T cells provides the costimulatory (second) signal for T cell activation?

A) TCR
B) CD3
C) CTLA-4
D) CD28 ✅
E) PD-1

Explanation: Signal 2 = CD28 (on T cell) binds B7-1/B7-2 (on APC). CTLA-4 and PD-1 are INHIBITORY checkpoint receptors.

Q28. Which interaction is REQUIRED for isotype class switching from IgM to IgG or IgA?

A) CD28–B7
B) TCR–MHC
C) CD40L–CD40 ✅
D) CD4–MHC Class I
E) PD-1–PD-L1

Explanation: CD40L (on activated Tfh/Th cells) binds CD40 (on B cells) → required for class switching. (This is the exact case scenario in Lecture 5.)

Q29. Affinity maturation of antibodies occurs through:

A) V(D)J recombination in bone marrow
B) Somatic hypermutation in germinal centers ✅
C) Class switching driven by cytokines
D) IgM to IgG conversion in the spleen
E) NK cell–B cell interactions

Q30. T-independent antigens (e.g., polysaccharides) differ from T-dependent antigens in that they:

A) Produce predominantly IgG
B) Cause affinity maturation
C) Generate memory B cells
D) Produce mainly low-affinity IgM with no memory cells ✅
E) Require CD40L–CD40 interaction

⚡ RAPID-FIRE SUMMARY TABLE

Topic	Key Fact
Papain digestion	2 Fab + 1 Fc
Breast milk Ab	Secretory IgA
Placental transfer	IgG via FcRn
Complement activators	IgG + IgM (IgM > IgG)
Primary response Ab	IgM
Secondary response Ab	IgG (affinity matured)
TI antigen	Polysaccharides → IgM, no memory
Th1 cytokine	IFN-γ → macrophage activation, granulomas
Th2 cytokines	IL-4 (IgE), IL-5 (eosinophils), IL-13 (mucus)
Th17 cytokines	IL-17 (neutrophils), IL-22 (mucosal barrier)
Treg cytokines	IL-10 + TGF-β (anti-inflammatory)
T-cell growth factor	IL-2
Perforin/Granzyme	CD8+ Tc cell killing
MHC I	All nucleated cells → CD8+, endogenous Ag
MHC II	APCs only → CD4+, exogenous Ag
MHC I structure	α chain + β2-microglobulin
MHC II structure	α + β (both HLA-encoded)
Ankylosing spondylitis	HLA-B27
Rheumatoid arthritis	HLA-DR4
Signal 2 (T activation)	CD28 ↔ B7 (CD80/CD86)
Class switch signal	CD40L ↔ CD40
Superantigen	Bypasses groove → binds MHC-II + TCR → cytokine storm
Most important APC	Dendritic cell

30 MCQs total — all derived directly from your lecture slides with full explanations. Good luck on your BMC exam! 🎯

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