Question 1

Pseudomonas aeruginosa is a true pathogen with a long list of virulence factors.

Accepted Answer

A) True 
 B)False  False

Question 2

A virulence factor common to many members of the Enterobacteriaceae which permits them to deliver harmful proteins directly to cells is

Accepted Answer

A)   fimbriae.
B)   a glycocalyx.
C)   type III secretion system.
D)   pili.
E)   porins.F) A) and D)
G) A) and C)

Question 3

Which of the following statements about Neisseria gonorrhoeae is FALSE?

Accepted Answer

A)   It causes disease in humans only.
B)   The gonococci stick to epithelial cells via fimbriae and capsules.
C)   The gonococci secrete a protease that destroys secretory IgA.
D)   The gonococci induce lasting immunity.
E)   Infected women are often asymptomatic.F) B) and C)
G) A) and E) D

Question 4

Which of the following are virulence factors contributing the pathogenicity of Neisseria species?

Accepted Answer

A)   hemolysin
B)   fimbriae
C)   a capsule
D)   exotoxins
E)   both a capsule and fimbriaeF) A) and B)
G) A) and D)

Question 5

Members of the Enterobacteriaceae can be distinguished from each other by

Accepted Answer

A)   the presence or absence of the enzyme oxidase.
B)   the ability to ferment lactose.
C)   motility.
D)   both motility and the presence or absence of the enzyme oxidase.
E)   both motility and the ability to ferment lactose.F) None of the above
G) B) and E)

Question 6

What is the significance of the infective body formed by Coxiella bacteria,intracellular parasites that cause a zoonosis in humans?

Accepted Answer

A)   It uses actin filaments to move from cell to cell.
B)   It is a resistant stage similar to an endospore.
C)   It can grow in extracellular fluid for short periods of time.
D)   It is only produced when Coxiella is in a tick.
E)   It is a fragile stage found only inside cells.F) B) and E)
G) None of the above

Question 7

Bordetella pertussis causes disease by

Accepted Answer

A)   the development of pneumonia.
B)   interfering with the action of the ciliated epithelial cells of the trachea.
C)   suppressing the production of mucus by the respiratory lining.
D)   forming a pseudomembrane that obstructs the larynx.
E)   irritating the diaphragm, which leads to severe coughing attacks.F) None of the above
G) A) and D) B

Question 8

Salmonella and Shigella,both causes of diarrhea,can be distinguished by which of the following tests?

Accepted Answer

A)   lactose fermentation
B)   oxidase test
C)   motility
D)   urease test
E)   pigment productionF) B) and D)
G) C) and D)

Question 9

What is the antimicrobial agent of choice for treating Bacteroides infections?

Accepted Answer

A)   erythromycin
B)   tetracycline
C)   metronidazole
D)   cephalosporin
E)   bacitracinF) A) and D)
G) None of the above

Question 10

The small,oxidase positive nonmotile bacterium ________ is part of the normal microbiota of dogs,but bites can lead to infection in humans.

Accepted Answer

A)   Pasteurella
B)   Hafnia
C)   Salmonella
D)   Enterobacter
E)   YersinaF) A) and B)
G) D) and E)

Question 11

Humans are the sole hosts of Salmonella enterica subtype Typhi (formerly S.typhi).

Accepted Answer

A) True 
 B)False

Question 12

Cat scratch disease is caused by

Accepted Answer

A)   Bartonella bacilliformis.
B)   Bartonella henselae.
C)   Bartonella quintana.
D)   Bartonella peliosis.
E)   Bartonella angiomatosis.F) A) and D)
G) B) and D)

Question 13

Serratia marcescens can be identified by its distinctive blue-green pigment pyocyanin.

Accepted Answer

A) True 
 B)False

Question 14

After a week of asymptomatic infection with Bordetella pertussis,the patient has cold-like (catarrhal)symptoms for a week or two followed by a period of severe paroxysmal episodes of coughing that leave the patient anoxic and fatigued.

Accepted Answer

A) True 
 B)False

Question 15

MacConkey agar is selective for Haemophilus influenzae.

Accepted Answer

A) True 
 B)False

Question 16

Pneumonia caused by Klebsiella pneumoniae often involves the destruction of (alveoli/macrophages/epithelium)and the production of bloody sputum.

Accepted Answer

The answer of Pneumonia caused by Klebsiella pneumoniae often involves...

Question 17

The true pathogen (Salmonella/Shigella/Yersinia)is a noncoliform,nonmotile,oxidase-negative member of the Enterobacteriaceae that does not produce hydrogen sulfide.

Accepted Answer

The answer of The true pathogen (Salmonella/Shigella/Yersinia)is a noncoliform,nonmotile,oxidase-negative member...

Question 18

A lesion called ________ is a characteristic of an infection with Haemophilus ducreyi.

Accepted Answer

A)   a bubo
B)   a chancroid or soft chancre
C)   an eschar
D)   ophthalmia neonatorum
E)   petechiaeF) B) and E)
G) A) and B)

Question 19

Infection with ________ usually produces acute upper respiratory disease but may cause meningitis in infants 3-18 months old.

Accepted Answer

A)   Klebsiella pneumoniae
B)   Francisella tularensis
C)   Coxiella burnetii
D)   Haemophilus influenzae
E)   Hafnia speciesF) All of the above
G) A) and D)

Question 20

Coliforms are distinguished from noncoliforms by their ability to ferment (glucose/citrate/lactose).

Accepted Answer

The answer of Coliforms are distinguished from noncoliforms by their...

Exam 20: Pathogenic Gram-Negative Cocci and Bacilli

Pseudomonas aeruginosa is a true pathogen with a long list of virulence factors.

Correct AnswerverifiedFalse

A virulence factor common to many members of the Enterobacteriaceae which permits them to deliver harmful proteins directly to cells is

Correct AnswerverifiedShow Answer

Which of the following statements about Neisseria gonorrhoeae is FALSE?

Correct AnswerverifiedD

Which of the following are virulence factors contributing the pathogenicity of Neisseria species?

Correct AnswerverifiedShow Answer

Members of the Enterobacteriaceae can be distinguished from each other by

Correct AnswerverifiedShow Answer

What is the significance of the infective body formed by Coxiella bacteria,intracellular parasites that cause a zoonosis in humans?

Correct AnswerverifiedShow Answer

Bordetella pertussis causes disease by

Correct AnswerverifiedB

Salmonella and Shigella,both causes of diarrhea,can be distinguished by which of the following tests?

Correct AnswerverifiedShow Answer

What is the antimicrobial agent of choice for treating Bacteroides infections?

Correct AnswerverifiedShow Answer

The small,oxidase positive nonmotile bacterium ________ is part of the normal microbiota of dogs,but bites can lead to infection in humans.

Correct AnswerverifiedShow Answer

Humans are the sole hosts of Salmonella enterica subtype Typhi (formerly S.typhi).

Correct AnswerverifiedShow Answer

Cat scratch disease is caused by

Correct AnswerverifiedShow Answer

Serratia marcescens can be identified by its distinctive blue-green pigment pyocyanin.

Correct AnswerverifiedShow Answer

After a week of asymptomatic infection with Bordetella pertussis,the patient has cold-like (catarrhal)symptoms for a week or two followed by a period of severe paroxysmal episodes of coughing that leave the patient anoxic and fatigued.

Correct AnswerverifiedShow Answer

MacConkey agar is selective for Haemophilus influenzae.

Correct AnswerverifiedShow Answer

Pneumonia caused by Klebsiella pneumoniae often involves the destruction of (alveoli/macrophages/epithelium)and the production of bloody sputum.

Correct AnswerverifiedShow Answer

The true pathogen (Salmonella/Shigella/Yersinia)is a noncoliform,nonmotile,oxidase-negative member of the Enterobacteriaceae that does not produce hydrogen sulfide.

Correct AnswerverifiedShow Answer

A lesion called ________ is a characteristic of an infection with Haemophilus ducreyi.

Correct AnswerverifiedShow Answer

Infection with ________ usually produces acute upper respiratory disease but may cause meningitis in infants 3-18 months old.

Correct AnswerverifiedShow Answer

Coliforms are distinguished from noncoliforms by their ability to ferment (glucose/citrate/lactose).

Correct AnswerverifiedShow Answer

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False

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D

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