PASSPOINT PRO
BIOL 3201
IMMUNOLOGY
Final Exam Practice - Set 1
Cumulative Modules 1-7
150 QUESTIONS A-D FORMAT EXPLAINED
Mixed cumulative practice Recall + mechanism + application Answer + rationale after each item
Coverage: immune-system organization; cells, tissues and lymphoid organs; innate recognition,
inflammation and complement; antibodies and B-cell development; TCRs, MHC and antigen
presentation; thymic selection and T-cell activation; healing, hypersensitivity and immunological
memory. Questions are mixed across modules to support cumulative final-exam preparation.
,BIOL 3201 IMMUNOLOGY - FINAL EXAM PRACTICE SET 1
FINAL EXAM PRACTICE - HOW TO USE THIS SET
Work each item before reading the answer box. This set deliberately mixes Modules 1-7, so the task is not just recall: identify
the immune compartment involved, the relevant cell or molecule, and the sequence that connects recognition to effector
function, regulation, memory, or repair.
001 What is the best distinction between antibody affinity and avidity?
A. Affinity is strength at one binding site; avidity is the combined strength of multiple interactions
B. Affinity applies only to IgM; avidity applies only to IgG
C. Affinity is determined by Fc; avidity is determined only by complement
D. They are identical terms with no functional distinction
Answer: A
Explanation: Affinity describes the strength of interaction between one antigen-binding site and its epitope. Avidity reflects the overall binding strength
generated by multiple simultaneous interactions. IgM can therefore achieve high avidity even when the affinity of each individual site is moderate.
002 A tissue sample contains a large cell that engulfs dead cells and secretes inflammatory mediators. Which identity is
most likely?
A. Plasma cell
B. B lymphocyte
C. Macrophage
D. Eosinophil only
Answer: C
Explanation: Macrophages are large tissue phagocytes that clear microbes, dead cells, and debris. They also produce cytokines and other mediators
that shape local inflammation and repair. Their phenotype varies according to tissue location and local signals.
003 For a naive T cell, "signal 1" most directly refers to:
A. CD28 binding B7 without TCR engagement
B. TCR recognition of a specific peptide-MHC complex
C. IL-2 binding its receptor only
D. Perforin release into a target cell
Answer: B
Explanation: Signal 1 is antigen-specific recognition through the TCR, with the appropriate coreceptor engaging peptide-MHC. This provides
specificity but is generally not sufficient by itself for full activation of a naive T cell.
004 Which statement best describes the relationship between infection and disease?
A. Infection is invasion or growth of a microbe, while disease refers to resulting dysfunction or symptoms
B. Every infection always produces severe disease
C. Disease always occurs before infection
D. The two terms are always identical
Answer: A
Explanation: Infection refers to entry and multiplication of a microorganism in the host, whereas disease refers to harmful effects that impair normal
function. Some infections remain asymptomatic because host defenses contain them. Disease severity reflects both microbial factors and host
responses.
005 Which cells are the central players of adaptive immunity?
A. Erythrocytes and platelets
B. B lymphocytes and T lymphocytes
C. Fibroblasts and adipocytes
D. Keratinocytes and osteocytes
PassPoint Pro | Cumulative Modules 1-7 | Answers + explanations after each question Page 2
, BIOL 3201 IMMUNOLOGY - FINAL EXAM PRACTICE SET 1
Answer: B
Explanation: B and T lymphocytes are the main cellular components of adaptive immunity. B cells can differentiate into antibody-secreting plasma
cells, while T cells perform helper, regulatory, and cytotoxic functions. Their antigen receptors provide the specificity typical of adaptive responses.
006 Compared with CD28, CTLA-4 generally:
A. Provides stronger positive costimulation in all settings
B. Opposes activation by competing for B7 ligands and delivering inhibitory effects
C. Acts only as a cytotoxic granule enzyme
D. Binds peptide inside the MHC groove
Answer: B
Explanation: CD28 promotes activation when it binds B7, whereas CTLA-4 helps reduce activation. Competition for B7 and inhibitory signaling
contribute to control of expanding T-cell responses.
007 Which statement about immune memory is most accurate?
A. It is mainly a property of adaptive immunity and improves responses to previously encountered antigens
B. It requires every innate cell to live for decades
C. It prevents the immune system from responding to new antigens
D. It is identical to inflammation
Answer: A
Explanation: Adaptive immune memory is produced when antigen-specific B and T lymphocytes generate long-lived populations after activation.
These cells improve the speed and quality of later responses to the same antigen. Memory does not prevent responses to new antigens.
008 Cytokines produced during a T-dependent B-cell response can influence:
A. The original V(D)J sequence of every B cell before development
B. Which heavy-chain isotype the B cell switches to
C. Whether the antigen contains peptide bonds
D. The number of chromosomes in the antibody molecule
Answer: B
Explanation: Cytokines from helper T cells and the surrounding immune environment help guide class-switch choices. Different isotypes are suited to
different effector contexts and anatomical sites. The antigen-binding variable region generally remains the same during class switching.
009 Which statement best summarizes the purpose of organized lymphoid tissues?
A. They isolate all immune cells from antigens
B. They serve only as storage sites for mature erythrocytes
C. They replace the need for cellular trafficking
D. They concentrate immune cells and antigens so rare, specific interactions can occur efficiently
Answer: D
Explanation: Immune responses often depend on rare antigen-specific lymphocytes finding the right antigen. Organized lymphoid tissues concentrate
cells, antigens, and signaling networks in predictable compartments. This architecture makes immune surveillance and activation far more efficient
than random encounters in the circulation.
010 When a CD8 T cell surveys a healthy nucleated cell, the peptide-MHC complexes it encounters usually include:
A. Many self peptides derived from normal intracellular proteins
B. Only peptides from extracellular bacteria
C. Only antibody fragments
D. No peptides unless infection is present
Answer: A
Explanation: MHC class I continuously displays samples of the intracellular protein environment, including abundant normal self peptides. Infection or
transformation can introduce new peptides into that display. T-cell tolerance normally prevents destructive responses to ordinary self peptide-MHC
complexes.
PassPoint Pro | Cumulative Modules 1-7 | Answers + explanations after each question Page 3
BIOL 3201
IMMUNOLOGY
Final Exam Practice - Set 1
Cumulative Modules 1-7
150 QUESTIONS A-D FORMAT EXPLAINED
Mixed cumulative practice Recall + mechanism + application Answer + rationale after each item
Coverage: immune-system organization; cells, tissues and lymphoid organs; innate recognition,
inflammation and complement; antibodies and B-cell development; TCRs, MHC and antigen
presentation; thymic selection and T-cell activation; healing, hypersensitivity and immunological
memory. Questions are mixed across modules to support cumulative final-exam preparation.
,BIOL 3201 IMMUNOLOGY - FINAL EXAM PRACTICE SET 1
FINAL EXAM PRACTICE - HOW TO USE THIS SET
Work each item before reading the answer box. This set deliberately mixes Modules 1-7, so the task is not just recall: identify
the immune compartment involved, the relevant cell or molecule, and the sequence that connects recognition to effector
function, regulation, memory, or repair.
001 What is the best distinction between antibody affinity and avidity?
A. Affinity is strength at one binding site; avidity is the combined strength of multiple interactions
B. Affinity applies only to IgM; avidity applies only to IgG
C. Affinity is determined by Fc; avidity is determined only by complement
D. They are identical terms with no functional distinction
Answer: A
Explanation: Affinity describes the strength of interaction between one antigen-binding site and its epitope. Avidity reflects the overall binding strength
generated by multiple simultaneous interactions. IgM can therefore achieve high avidity even when the affinity of each individual site is moderate.
002 A tissue sample contains a large cell that engulfs dead cells and secretes inflammatory mediators. Which identity is
most likely?
A. Plasma cell
B. B lymphocyte
C. Macrophage
D. Eosinophil only
Answer: C
Explanation: Macrophages are large tissue phagocytes that clear microbes, dead cells, and debris. They also produce cytokines and other mediators
that shape local inflammation and repair. Their phenotype varies according to tissue location and local signals.
003 For a naive T cell, "signal 1" most directly refers to:
A. CD28 binding B7 without TCR engagement
B. TCR recognition of a specific peptide-MHC complex
C. IL-2 binding its receptor only
D. Perforin release into a target cell
Answer: B
Explanation: Signal 1 is antigen-specific recognition through the TCR, with the appropriate coreceptor engaging peptide-MHC. This provides
specificity but is generally not sufficient by itself for full activation of a naive T cell.
004 Which statement best describes the relationship between infection and disease?
A. Infection is invasion or growth of a microbe, while disease refers to resulting dysfunction or symptoms
B. Every infection always produces severe disease
C. Disease always occurs before infection
D. The two terms are always identical
Answer: A
Explanation: Infection refers to entry and multiplication of a microorganism in the host, whereas disease refers to harmful effects that impair normal
function. Some infections remain asymptomatic because host defenses contain them. Disease severity reflects both microbial factors and host
responses.
005 Which cells are the central players of adaptive immunity?
A. Erythrocytes and platelets
B. B lymphocytes and T lymphocytes
C. Fibroblasts and adipocytes
D. Keratinocytes and osteocytes
PassPoint Pro | Cumulative Modules 1-7 | Answers + explanations after each question Page 2
, BIOL 3201 IMMUNOLOGY - FINAL EXAM PRACTICE SET 1
Answer: B
Explanation: B and T lymphocytes are the main cellular components of adaptive immunity. B cells can differentiate into antibody-secreting plasma
cells, while T cells perform helper, regulatory, and cytotoxic functions. Their antigen receptors provide the specificity typical of adaptive responses.
006 Compared with CD28, CTLA-4 generally:
A. Provides stronger positive costimulation in all settings
B. Opposes activation by competing for B7 ligands and delivering inhibitory effects
C. Acts only as a cytotoxic granule enzyme
D. Binds peptide inside the MHC groove
Answer: B
Explanation: CD28 promotes activation when it binds B7, whereas CTLA-4 helps reduce activation. Competition for B7 and inhibitory signaling
contribute to control of expanding T-cell responses.
007 Which statement about immune memory is most accurate?
A. It is mainly a property of adaptive immunity and improves responses to previously encountered antigens
B. It requires every innate cell to live for decades
C. It prevents the immune system from responding to new antigens
D. It is identical to inflammation
Answer: A
Explanation: Adaptive immune memory is produced when antigen-specific B and T lymphocytes generate long-lived populations after activation.
These cells improve the speed and quality of later responses to the same antigen. Memory does not prevent responses to new antigens.
008 Cytokines produced during a T-dependent B-cell response can influence:
A. The original V(D)J sequence of every B cell before development
B. Which heavy-chain isotype the B cell switches to
C. Whether the antigen contains peptide bonds
D. The number of chromosomes in the antibody molecule
Answer: B
Explanation: Cytokines from helper T cells and the surrounding immune environment help guide class-switch choices. Different isotypes are suited to
different effector contexts and anatomical sites. The antigen-binding variable region generally remains the same during class switching.
009 Which statement best summarizes the purpose of organized lymphoid tissues?
A. They isolate all immune cells from antigens
B. They serve only as storage sites for mature erythrocytes
C. They replace the need for cellular trafficking
D. They concentrate immune cells and antigens so rare, specific interactions can occur efficiently
Answer: D
Explanation: Immune responses often depend on rare antigen-specific lymphocytes finding the right antigen. Organized lymphoid tissues concentrate
cells, antigens, and signaling networks in predictable compartments. This architecture makes immune surveillance and activation far more efficient
than random encounters in the circulation.
010 When a CD8 T cell surveys a healthy nucleated cell, the peptide-MHC complexes it encounters usually include:
A. Many self peptides derived from normal intracellular proteins
B. Only peptides from extracellular bacteria
C. Only antibody fragments
D. No peptides unless infection is present
Answer: A
Explanation: MHC class I continuously displays samples of the intracellular protein environment, including abundant normal self peptides. Infection or
transformation can introduce new peptides into that display. T-cell tolerance normally prevents destructive responses to ordinary self peptide-MHC
complexes.
PassPoint Pro | Cumulative Modules 1-7 | Answers + explanations after each question Page 3
