BIOD 171 MICROBIOLOGY
MODULE 5 EXAM STUDY GUIDE
200 PRACTICE QUESTIONS WITH
ANSWERS & RATIONALES
(COMPLETE EXAM REVIEW)
Microbiology – BIOD 171 Module 5 Practice Exam
1. Which type of immunity is acquired after recovering from
an infection?
A. Passive immunity
B. Artificial immunity
C. Natural active immunity
D. Innate immunity
Answer: C. Natural active immunity
Natural active immunity develops when the body produces antibodies
after exposure to a pathogen.
2. Which cells are responsible for producing antibodies?
A. T cells
B. Plasma cells
C. Macrophages
D. Neutrophils
Answer: B. Plasma cells
Plasma cells are differentiated B lymphocytes that produce antibodies.
3. Which antibody is the most abundant in human blood?
A. IgA
B. IgD
C. IgG
D. IgE
,Answer: C. IgG
IgG is the most common antibody in serum and provides long-term
immunity.
4. Which immune cells directly kill infected cells?
A. Helper T cells
B. Cytotoxic T cells
C. B cells
D. Plasma cells
Answer: B. Cytotoxic T cells
Cytotoxic T cells destroy infected or cancerous cells.
5. Which antibody is primarily found in mucosal secretions?
A. IgG
B. IgM
C. IgA
D. IgD
Answer: C. IgA
IgA protects mucosal surfaces such as respiratory and gastrointestinal
tracts.
6. Which component of the immune system is considered the
first line of defense?
A. Skin
B. Antibodies
C. T cells
D. Complement proteins
Answer: A. Skin
Physical barriers like skin prevent pathogens from entering the body.
7. Which cells engulf and digest pathogens?
A. B cells
B. Phagocytes
,C. Plasma cells
D. Mast cells
Answer: B. Phagocytes
Phagocytes such as macrophages ingest and destroy microbes.
8. Which antibody is involved in allergic reactions?
A. IgG
B. IgM
C. IgA
D. IgE
Answer: D. IgE
IgE triggers histamine release from mast cells during allergic
responses.
9. Which immune cells coordinate immune responses?
A. Cytotoxic T cells
B. Helper T cells
C. Plasma cells
D. NK cells
Answer: B. Helper T cells
Helper T cells release cytokines that activate other immune cells.
10. Which immune response is nonspecific?
A. Adaptive immunity
B. Innate immunity
C. Humoral immunity
D. Antibody-mediated immunity
Answer: B. Innate immunity
Innate immunity provides immediate, nonspecific defense.
11. Which molecule enhances phagocytosis by coating
pathogens?
, A. Antigen
B. Opsonin
C. Cytokine
D. Complement
Answer: B. Opsonin
Opsonins mark pathogens for destruction by phagocytes.
12. Which cells release histamine during inflammation?
A. Mast cells
B. Neutrophils
C. Macrophages
D. B cells
Answer: A. Mast cells
Mast cells release histamine, causing vasodilation and inflammation.
13. Which immune response involves antibody production?
A. Cellular immunity
B. Humoral immunity
C. Innate immunity
D. Inflammatory response
Answer: B. Humoral immunity
Humoral immunity is mediated by antibodies produced by B cells.
14. Which antibody is produced first during an infection?
A. IgA
B. IgE
C. IgM
D. IgG
Answer: C. IgM
IgM is the first antibody produced during the primary immune
response.
MODULE 5 EXAM STUDY GUIDE
200 PRACTICE QUESTIONS WITH
ANSWERS & RATIONALES
(COMPLETE EXAM REVIEW)
Microbiology – BIOD 171 Module 5 Practice Exam
1. Which type of immunity is acquired after recovering from
an infection?
A. Passive immunity
B. Artificial immunity
C. Natural active immunity
D. Innate immunity
Answer: C. Natural active immunity
Natural active immunity develops when the body produces antibodies
after exposure to a pathogen.
2. Which cells are responsible for producing antibodies?
A. T cells
B. Plasma cells
C. Macrophages
D. Neutrophils
Answer: B. Plasma cells
Plasma cells are differentiated B lymphocytes that produce antibodies.
3. Which antibody is the most abundant in human blood?
A. IgA
B. IgD
C. IgG
D. IgE
,Answer: C. IgG
IgG is the most common antibody in serum and provides long-term
immunity.
4. Which immune cells directly kill infected cells?
A. Helper T cells
B. Cytotoxic T cells
C. B cells
D. Plasma cells
Answer: B. Cytotoxic T cells
Cytotoxic T cells destroy infected or cancerous cells.
5. Which antibody is primarily found in mucosal secretions?
A. IgG
B. IgM
C. IgA
D. IgD
Answer: C. IgA
IgA protects mucosal surfaces such as respiratory and gastrointestinal
tracts.
6. Which component of the immune system is considered the
first line of defense?
A. Skin
B. Antibodies
C. T cells
D. Complement proteins
Answer: A. Skin
Physical barriers like skin prevent pathogens from entering the body.
7. Which cells engulf and digest pathogens?
A. B cells
B. Phagocytes
,C. Plasma cells
D. Mast cells
Answer: B. Phagocytes
Phagocytes such as macrophages ingest and destroy microbes.
8. Which antibody is involved in allergic reactions?
A. IgG
B. IgM
C. IgA
D. IgE
Answer: D. IgE
IgE triggers histamine release from mast cells during allergic
responses.
9. Which immune cells coordinate immune responses?
A. Cytotoxic T cells
B. Helper T cells
C. Plasma cells
D. NK cells
Answer: B. Helper T cells
Helper T cells release cytokines that activate other immune cells.
10. Which immune response is nonspecific?
A. Adaptive immunity
B. Innate immunity
C. Humoral immunity
D. Antibody-mediated immunity
Answer: B. Innate immunity
Innate immunity provides immediate, nonspecific defense.
11. Which molecule enhances phagocytosis by coating
pathogens?
, A. Antigen
B. Opsonin
C. Cytokine
D. Complement
Answer: B. Opsonin
Opsonins mark pathogens for destruction by phagocytes.
12. Which cells release histamine during inflammation?
A. Mast cells
B. Neutrophils
C. Macrophages
D. B cells
Answer: A. Mast cells
Mast cells release histamine, causing vasodilation and inflammation.
13. Which immune response involves antibody production?
A. Cellular immunity
B. Humoral immunity
C. Innate immunity
D. Inflammatory response
Answer: B. Humoral immunity
Humoral immunity is mediated by antibodies produced by B cells.
14. Which antibody is produced first during an infection?
A. IgA
B. IgE
C. IgM
D. IgG
Answer: C. IgM
IgM is the first antibody produced during the primary immune
response.
