BIOL 204
BIOL 204 Exam 5 Study Questions and
Answers 2026
Which of the following is NOT a way the normal microbiota of the intestine helps to
prevent infection?
a. It produces acids that lower the pH of the stomach.
b. It speeds up the process by which microbes are flushed from the digestive tract.
c. It consumes food and occupies space, outcompeting potential pathogens.
d. It generates large quantities of oxygen that kill anaerobic pathogens.
d
What types of microbes live in the intestines?
a. Diverse species of bacteria, archaea, and fungi,
especially Bacteroides and Firmicutes bacteria
b. A narrow range of bacteria, especially Firmicutes
c. A narrow range of bacteria and fungi, especially Bacteroides
d. Archaea and fungi only
a
What pathogen is the most important contributor to biofilms in plaque?
a. Staphylococcus aureus
b. Streptococcus mutans
c. Escherichia coli
d. Clostridium difficile
b
What type of organism causes thrush?
a. a bacterium
b. a virus
c. a fungus
d. a protozoan
c
BIOL 204
, BIOL 204
In mumps, what glands swell to produce the disease's characteristic appearance?
a. the sublingual glands
b. the gastric glands
c. the parotid glands
d. the submandibular glands
c
Which of the following is true of HSV-1?
a. It causes oral thrush in immunocompromised patients.
b. Infection is generally self-limiting.
c. It is a bacterium.
d. It is usually treated with amoxicillin.
b
Which type of E. coli infection can be severe with life-threatening consequences such as
hemolytic uremic syndrome?
a. ETEC
b. EPEC
c. EHEC
d. EIEC
c
Which species of Shigella has a type that produces Shiga toxin?
a. S. boydii
b. S. flexneri
c. S. dysenteriae
d. S. sonnei
c
Which type of bacterium produces an A-B toxin?
a. Salmonella
b. Vibrio cholera
c. ETEC
d. Shigella dysenteriae
BIOL 204
BIOL 204 Exam 5 Study Questions and
Answers 2026
Which of the following is NOT a way the normal microbiota of the intestine helps to
prevent infection?
a. It produces acids that lower the pH of the stomach.
b. It speeds up the process by which microbes are flushed from the digestive tract.
c. It consumes food and occupies space, outcompeting potential pathogens.
d. It generates large quantities of oxygen that kill anaerobic pathogens.
d
What types of microbes live in the intestines?
a. Diverse species of bacteria, archaea, and fungi,
especially Bacteroides and Firmicutes bacteria
b. A narrow range of bacteria, especially Firmicutes
c. A narrow range of bacteria and fungi, especially Bacteroides
d. Archaea and fungi only
a
What pathogen is the most important contributor to biofilms in plaque?
a. Staphylococcus aureus
b. Streptococcus mutans
c. Escherichia coli
d. Clostridium difficile
b
What type of organism causes thrush?
a. a bacterium
b. a virus
c. a fungus
d. a protozoan
c
BIOL 204
, BIOL 204
In mumps, what glands swell to produce the disease's characteristic appearance?
a. the sublingual glands
b. the gastric glands
c. the parotid glands
d. the submandibular glands
c
Which of the following is true of HSV-1?
a. It causes oral thrush in immunocompromised patients.
b. Infection is generally self-limiting.
c. It is a bacterium.
d. It is usually treated with amoxicillin.
b
Which type of E. coli infection can be severe with life-threatening consequences such as
hemolytic uremic syndrome?
a. ETEC
b. EPEC
c. EHEC
d. EIEC
c
Which species of Shigella has a type that produces Shiga toxin?
a. S. boydii
b. S. flexneri
c. S. dysenteriae
d. S. sonnei
c
Which type of bacterium produces an A-B toxin?
a. Salmonella
b. Vibrio cholera
c. ETEC
d. Shigella dysenteriae
BIOL 204
