BIOL 271 Module 6 Exam Practice Questions &
Answers (Verified Update)
This comprehensive study guide covers the core domains tested
on BIOL 271 Module 6: Immunology, Host Defense
Mechanisms & Virology at Portage Learning. It includes original
practice questions with detailed rationales, organized by the
core exam domains: Innate Immunity & First-Line Defenses,
Adaptive Immunity (Humoral & Cell-Mediated), Host Defense
Mechanisms & Immune Evasion, Virology & Viral Replication,
and Viral Pathogenesis & Clinical Applications.
Exam Overview & Blueprint:
Parameter Details
Exam Format LockDown Browser, multiple-choice, true/false, fill-in-the-blank, and short-answer questio
Module 6
Immunology, host defense, virology, viral replication, and viral pathogenesis
Coverage
Innate vs. adaptive immunity, physical/chemical barriers, phagocytosis, inflammation,
Core Topics complement, B cells, T cells, antibodies, MHC, viral structure, viral life cycle, bacteriophage
viral pathogenesis, vaccines
NGN-style case studies, immune evasion mechanisms, viral replication logic, clinical
2026 Focus
application of immunology
,Section 1: Innate Immunity & First-Line Defenses (Q1–Q50)
Q1. What is the primary characteristic of innate immunity?
A) It is specific to a particular pathogen
B) It provides immediate, non-specific protection
C) It requires prior exposure to a pathogen
D) It involves memory responses
Answer: B
Rationale: Innate immunity is the body's first line of defense,
present from birth, and provides immediate, non-specific
protection against a wide range of pathogens. It does not
require prior exposure and lacks immunological memory.
Q2. Which of the following is a physical barrier of the first line
of defense?
A) Skin and mucous membranes
B) Phagocytes
C) Antibodies
D) T lymphocytes
Answer: A
Rationale: The first line of defense consists of physical and
chemical barriers, including the skin and mucous membranes,
which prevent pathogen entry into the body.
Q3. What is the role of lysozyme in innate immunity?
,A) It breaks down bacterial cell walls
B) It produces antibodies
C) It activates T cells
D) It forms blood clots
Answer: A
Rationale: Lysozyme is an enzyme found in tears, saliva, and
other secretions that breaks down the peptidoglycan cell walls
of bacteria, providing a chemical defense against infection.
Q4. Which of the following is a chemical barrier of the first line
of defense?
A) Low pH of the skin
B) Phagocytosis
C) Inflammation
D) Fever
Answer: A
Rationale: The low pH of the skin and other secretions (e.g.,
stomach acid) creates an environment that inhibits microbial
growth, serving as a chemical barrier.
Q5. What is the role of normal flora in innate immunity?
A) They compete with pathogens for nutrients and space
B) They produce antibodies
C) They activate T cells
D) They form blood clots
, Answer: A
Rationale: Normal flora (commensal organisms) provide
protection by competing with pathogens for nutrients and
attachment sites, producing antimicrobial substances, and
stimulating the immune system.
Q6. Which cells are the primary phagocytes in the innate
immune system?
A) Neutrophils and macrophages
B) B cells and T cells
C) Erythrocytes and platelets
D) Basophils and eosinophils
Answer: A
Rationale: Neutrophils and macrophages are the primary
phagocytic cells of the innate immune system. They engulf and
destroy pathogens through phagocytosis.
Q7. What is the process of phagocytosis?
A) The engulfment and destruction of pathogens by immune
cells
B) The production of antibodies
C) The activation of T cells
D) The formation of blood clots
Answer: A
Rationale: Phagocytosis is the process by which phagocytic cells
Answers (Verified Update)
This comprehensive study guide covers the core domains tested
on BIOL 271 Module 6: Immunology, Host Defense
Mechanisms & Virology at Portage Learning. It includes original
practice questions with detailed rationales, organized by the
core exam domains: Innate Immunity & First-Line Defenses,
Adaptive Immunity (Humoral & Cell-Mediated), Host Defense
Mechanisms & Immune Evasion, Virology & Viral Replication,
and Viral Pathogenesis & Clinical Applications.
Exam Overview & Blueprint:
Parameter Details
Exam Format LockDown Browser, multiple-choice, true/false, fill-in-the-blank, and short-answer questio
Module 6
Immunology, host defense, virology, viral replication, and viral pathogenesis
Coverage
Innate vs. adaptive immunity, physical/chemical barriers, phagocytosis, inflammation,
Core Topics complement, B cells, T cells, antibodies, MHC, viral structure, viral life cycle, bacteriophage
viral pathogenesis, vaccines
NGN-style case studies, immune evasion mechanisms, viral replication logic, clinical
2026 Focus
application of immunology
,Section 1: Innate Immunity & First-Line Defenses (Q1–Q50)
Q1. What is the primary characteristic of innate immunity?
A) It is specific to a particular pathogen
B) It provides immediate, non-specific protection
C) It requires prior exposure to a pathogen
D) It involves memory responses
Answer: B
Rationale: Innate immunity is the body's first line of defense,
present from birth, and provides immediate, non-specific
protection against a wide range of pathogens. It does not
require prior exposure and lacks immunological memory.
Q2. Which of the following is a physical barrier of the first line
of defense?
A) Skin and mucous membranes
B) Phagocytes
C) Antibodies
D) T lymphocytes
Answer: A
Rationale: The first line of defense consists of physical and
chemical barriers, including the skin and mucous membranes,
which prevent pathogen entry into the body.
Q3. What is the role of lysozyme in innate immunity?
,A) It breaks down bacterial cell walls
B) It produces antibodies
C) It activates T cells
D) It forms blood clots
Answer: A
Rationale: Lysozyme is an enzyme found in tears, saliva, and
other secretions that breaks down the peptidoglycan cell walls
of bacteria, providing a chemical defense against infection.
Q4. Which of the following is a chemical barrier of the first line
of defense?
A) Low pH of the skin
B) Phagocytosis
C) Inflammation
D) Fever
Answer: A
Rationale: The low pH of the skin and other secretions (e.g.,
stomach acid) creates an environment that inhibits microbial
growth, serving as a chemical barrier.
Q5. What is the role of normal flora in innate immunity?
A) They compete with pathogens for nutrients and space
B) They produce antibodies
C) They activate T cells
D) They form blood clots
, Answer: A
Rationale: Normal flora (commensal organisms) provide
protection by competing with pathogens for nutrients and
attachment sites, producing antimicrobial substances, and
stimulating the immune system.
Q6. Which cells are the primary phagocytes in the innate
immune system?
A) Neutrophils and macrophages
B) B cells and T cells
C) Erythrocytes and platelets
D) Basophils and eosinophils
Answer: A
Rationale: Neutrophils and macrophages are the primary
phagocytic cells of the innate immune system. They engulf and
destroy pathogens through phagocytosis.
Q7. What is the process of phagocytosis?
A) The engulfment and destruction of pathogens by immune
cells
B) The production of antibodies
C) The activation of T cells
D) The formation of blood clots
Answer: A
Rationale: Phagocytosis is the process by which phagocytic cells
