BIOL251 EXAM 3 QUESTIONS WITH CORRECT
ANSWERS 2026 RATED A+
1. Which of the following describes hyaluronidase?
a. Produced by bacteria; helps bacteria invade host tissues
b. Produced by bacteria; lyses blood cells
c. Produced by bacteria; acts as an adhesion molecule
d. Produced by the host; kills bacteria
e. Produced by the host; helps protect against bacterial invasion -ANSWER- a. Produced by
bacteria; helps bacteria invade host tissues
2. What do phospholipases do?
a. promote pathogen growth
b. acts as an adhesion molecule
c. breakdown proteins
d. destroy nucleic acid
e. degrade host cell membranes -ANSWER- e. degrade host cell membranes
3. Botulinum toxin causes what effect on the host?
a. cytokine storm
b. cell lysis
c. severe muscle contractions
d. flaccid paralysis
e. tissue damage -ANSWER- d. flaccid paralysis
4. Which of the following would not be part of the treatment for a patient with
gas gangrene?
a. intravenous antibiotics
b. hyperbaric oxygen therapy
, c. surgery
d. removal of dead tissue
e. steroid therapy -ANSWER- e. steroid therapy
5. How do strains of Streptococcus pyogenes that cause necrotizing fasciitis
differ from those that cause strep throat?
BIOL251 Exam 3
Study online at https -ANSWER-//quizlet.com/_h2fmmo
a. The more virulent strains just proliferate faster
b. These strains produce proteases, invasins and SpeB
c. They are more antibiotic resistant
d. Strains that cause strep throat produce no virulence factors
e. They are simply less common than those that cause strep throat -ANSWER- b. These strains
produce proteases, invasins and SpeB
6. What virulence factor is produced by gram-negative bacteria and in large
quantities can cause septic shock in patients?
a. AB toxin
b. botulinum toxin
c. hemolysin
d. endotoxin
e. exotoxin -ANSWER- d. endotoxin
7. What is the mechanism of AB toxins?
a. The toxin causes the host cell to lyse
b. The B subunit binds to the host cell and causes the cell to lyse
c. The A subunit binds to cell cell receptors; the B subunit harms the cell
d. The A subunit bind to the host cell and causes damage to the cell
ANSWERS 2026 RATED A+
1. Which of the following describes hyaluronidase?
a. Produced by bacteria; helps bacteria invade host tissues
b. Produced by bacteria; lyses blood cells
c. Produced by bacteria; acts as an adhesion molecule
d. Produced by the host; kills bacteria
e. Produced by the host; helps protect against bacterial invasion -ANSWER- a. Produced by
bacteria; helps bacteria invade host tissues
2. What do phospholipases do?
a. promote pathogen growth
b. acts as an adhesion molecule
c. breakdown proteins
d. destroy nucleic acid
e. degrade host cell membranes -ANSWER- e. degrade host cell membranes
3. Botulinum toxin causes what effect on the host?
a. cytokine storm
b. cell lysis
c. severe muscle contractions
d. flaccid paralysis
e. tissue damage -ANSWER- d. flaccid paralysis
4. Which of the following would not be part of the treatment for a patient with
gas gangrene?
a. intravenous antibiotics
b. hyperbaric oxygen therapy
, c. surgery
d. removal of dead tissue
e. steroid therapy -ANSWER- e. steroid therapy
5. How do strains of Streptococcus pyogenes that cause necrotizing fasciitis
differ from those that cause strep throat?
BIOL251 Exam 3
Study online at https -ANSWER-//quizlet.com/_h2fmmo
a. The more virulent strains just proliferate faster
b. These strains produce proteases, invasins and SpeB
c. They are more antibiotic resistant
d. Strains that cause strep throat produce no virulence factors
e. They are simply less common than those that cause strep throat -ANSWER- b. These strains
produce proteases, invasins and SpeB
6. What virulence factor is produced by gram-negative bacteria and in large
quantities can cause septic shock in patients?
a. AB toxin
b. botulinum toxin
c. hemolysin
d. endotoxin
e. exotoxin -ANSWER- d. endotoxin
7. What is the mechanism of AB toxins?
a. The toxin causes the host cell to lyse
b. The B subunit binds to the host cell and causes the cell to lyse
c. The A subunit binds to cell cell receptors; the B subunit harms the cell
d. The A subunit bind to the host cell and causes damage to the cell
