MBIO 3400 Exam 3 Spring 2025 latest
update (ch 17-23) questions with
complete solutions
Which of the following factors is primarily responsible for the ability of
Mycobacterium tuberculosis to survive long periods of time in dried droplets of
respiratory aerosols?
a. formation of tubercles
b. production of cord factor
c. the presence of mycolic acid in the cell wall
d. pyrogenic toxin
e. the presence of LPS in the outer membrane - correct answer ✔✔e
Opportunistic infections typical of AIDS but rare otherwise include _______
a. pneumocytis pneumonia and Kaposi's sarcoma
b. Kaposi's sarcoma
c. tuberculosis
d. pneumocytis pneumonia
e. tuberculosis and shingles - correct answer ✔✔a
The appearance of this rash is characteristic of infections with which of the
following? (photo)
,a. trypanosoma brucei
b. Epstein-Barr virus
c. scabies
d. Yersinia pestis
e. Borrelia burgdorferi - correct answer ✔✔e
Primary Infection with Epstein-Barr virus is known as ________
a. flu
b. bacterial meningitis
c. viral meningitis
d. infectious mononucleosis
e. AIDS - correct answer ✔✔d
How does tetanospasmin affect motor control?
a. it triggers the endocytosis of skeletal muscle cells
b. it blocks the release of inhibitory neurotransmitters in the CNS
c. it is an endotoxin
d. it induces nervous system proteins to fold into abnormal shapes
e. it blocks the secretion of acetylcholine into synaptic cleft - correct answer ✔✔b
Which of the following reactions is the result of type IV (delayed) hypersensitivity?
, a. breathing difficulties after exposure to mold spores
b. sensitivity to pet dander
c. dermatitis in response to poison ivy
d. Rheumatoid arthritis
e. runny nose triggers by pollen - correct answer ✔✔c
Which of the following is TRUE of foodbourne botulism?
a. large amounts of bacteria must be consumed to produce disease
b. it is not a life-threatening infection when left untreated
c. it is caused by Gram- bacterium
d. it is an intoxication disorder
e. it is caused by an aerobic Gram+ bacterium - correct answer ✔✔d
Common cold occurs more frequently in cold weather because ____________
a. cold viruses are not viable in the summer
b. the thick clothing people wear in cold weather speeds up virus transmission
c. cold viruses survive and transmit better in cold weather
d. people spend more time indoors, which facilitates virus transmission
e. both C and D - correct answer ✔✔e
Shingles, or herpes zoster, is a reactivation of the virus that causes _______
update (ch 17-23) questions with
complete solutions
Which of the following factors is primarily responsible for the ability of
Mycobacterium tuberculosis to survive long periods of time in dried droplets of
respiratory aerosols?
a. formation of tubercles
b. production of cord factor
c. the presence of mycolic acid in the cell wall
d. pyrogenic toxin
e. the presence of LPS in the outer membrane - correct answer ✔✔e
Opportunistic infections typical of AIDS but rare otherwise include _______
a. pneumocytis pneumonia and Kaposi's sarcoma
b. Kaposi's sarcoma
c. tuberculosis
d. pneumocytis pneumonia
e. tuberculosis and shingles - correct answer ✔✔a
The appearance of this rash is characteristic of infections with which of the
following? (photo)
,a. trypanosoma brucei
b. Epstein-Barr virus
c. scabies
d. Yersinia pestis
e. Borrelia burgdorferi - correct answer ✔✔e
Primary Infection with Epstein-Barr virus is known as ________
a. flu
b. bacterial meningitis
c. viral meningitis
d. infectious mononucleosis
e. AIDS - correct answer ✔✔d
How does tetanospasmin affect motor control?
a. it triggers the endocytosis of skeletal muscle cells
b. it blocks the release of inhibitory neurotransmitters in the CNS
c. it is an endotoxin
d. it induces nervous system proteins to fold into abnormal shapes
e. it blocks the secretion of acetylcholine into synaptic cleft - correct answer ✔✔b
Which of the following reactions is the result of type IV (delayed) hypersensitivity?
, a. breathing difficulties after exposure to mold spores
b. sensitivity to pet dander
c. dermatitis in response to poison ivy
d. Rheumatoid arthritis
e. runny nose triggers by pollen - correct answer ✔✔c
Which of the following is TRUE of foodbourne botulism?
a. large amounts of bacteria must be consumed to produce disease
b. it is not a life-threatening infection when left untreated
c. it is caused by Gram- bacterium
d. it is an intoxication disorder
e. it is caused by an aerobic Gram+ bacterium - correct answer ✔✔d
Common cold occurs more frequently in cold weather because ____________
a. cold viruses are not viable in the summer
b. the thick clothing people wear in cold weather speeds up virus transmission
c. cold viruses survive and transmit better in cold weather
d. people spend more time indoors, which facilitates virus transmission
e. both C and D - correct answer ✔✔e
Shingles, or herpes zoster, is a reactivation of the virus that causes _______
