Question 1

All of the following techniques are used for making definitive identification of anaerobes EXCEPT:

Accepted Answer

A)   PRAS and non-PRAS tubed biochemical test media
B)   Gas-liquid chromatography of metabolic end products
C)   Preexisting enzyme-based minisystems
D)   Mass spectroscopyE) None of the above
F) B) and C)

Question 2

What substances do organisms that use oxygen have to protect themselves from superoxide anions?

Accepted Answer

A)   Hyaluronidase and proteases
B)   Exotoxins and superoxide dismutase
C)   Enterotoxins and lipase
D)   Superoxide dismutase and catalaseE) All of the above
F) A) and D)

Question 3

Gram stains of specimens for anaerobic cultures should be examined for all the following reasons EXCEPT:

Accepted Answer

A)   The Gram stain reveals various types and relative number of bacteria present.
B)   Certain morphotypes may provide a presumptive identification and will guide media selection.
C)   The Gram stain often reveals the presence of leukocytes.
D)   The Clinical and Laboratory Standards Institute (CLSI)  guidelines recommend Gram stains on all anaerobic specimens.E) C) and D)
F) B) and D)

Question 4

A microbiology technologist is reading an anaerobic culture and observes a double zone of hemolysis on an anaerobically incubated sheep blood agar plate.The Gram stain of that organism was a boxcar-shaped,gram-positive bacillus.What organism is this?

Accepted Answer

A)   Clostridium perfringens
B)   C. difficile
C)   C. ramosum
D)   C. clostridiiformeE) B) and C)
F) None of the above

Question 5

What disease does Clostridium perfringens cause?

Accepted Answer

A)   Botulism
B)   Tetanus
C)   Food poisoning
D)   Toxic shock syndromeE) All of the above
F) A) and C)

Question 6

How long are anaerobic cultures routinely held in the laboratory?

Accepted Answer

A)   1 to 2 days
B)   3 to 4 days
C)   5 to 7 days
D)   7 to 9 daysE) None of the above
F) B) and D)

Question 7

An immunosuppressed patient notices sinus tracts that are draining pus.He also notices that there appear to be small,hard "nuggets" in the pus.What disease will his doctor most likely diagnose?

Accepted Answer

A)   Gas gangrene
B)   Pseudomembranous colitis
C)   Actinomycosis
D)   MyonecrosisE) C) and D)
F) B) and C)

Question 8

What organism mostly commonly causes gas gangrene?

Accepted Answer

A)   Clostridium difficile
B)   C. tetani
C)   C. perfringens
D)   C. botulinumE) A) and B)
F) None of the above

Question 9

Aerotolerant anaerobes include all the following EXCEPT:

Accepted Answer

A)   Clostridium
B)   Bacteroides
C)   Actinomyces
D)   BifidobacteriumE) B) and C)
F) None of the above

Question 10

How are suspected colonies of anaerobes processed?

Accepted Answer

A)   Gram stain morphology and reaction is observed.
B)   An aerotolerance test is set up.
C)   A pure culture/subculture plate is inoculated and appropriate disks are added.
D)   All of the above.E) A) and B)
F) None of the above

Question 11

All of the following are approaches to treating anaerobic infections EXCEPT:

Accepted Answer

A)   Surgical therapy
B)   Hyperbaric oxygen
C)   Antitoxins
D)   Enzyme inactivatorsE) B) and C)
F) None of the above

Question 12

Which of the following is considered a better specimen for anaerobic culture than a swab?

Accepted Answer

A)   Aspirate
B)   Washing
C)   Scraping
D)   LavageE) All of the above
F) C) and D)

Question 13

All of the following are non-spore-forming,anaerobic,gram-positive bacilli EXCEPT:

Accepted Answer

A)   Actinomyces
B)   Bifidobacterium
C)   Eubacterium
D)   ClostridiumE) A) and B)
F) C) and D)

Question 14

What disk is used to presumptively identify Peptostreptococcus anaerobius?

Accepted Answer

A)   Bile
B)   Nitrate
C)   Sodium polyanethol sulfonate
D)   IndoleE) A) and B)
F) All of the above

Exam 22: Anaerobes of Clinical Importance

What disease does Clostridium perfringens cause?

Correct Answer
verified

Aerotolerant anaerobes include all the following EXCEPT:

Correct Answer
verified

A microbiology technologist is reading an anaerobic culture and observes a double zone of hemolysis on an anaerobically incubated sheep blood agar plate.The Gram stain of that organism was a boxcar-shaped,gram-positive bacillus.What organism is this?

Correct Answer
verified

What disk is used to presumptively identify Peptostreptococcus anaerobius?

Correct Answer
verified

All of the following techniques are used for making definitive identification of anaerobes EXCEPT:

Correct Answer
verified

Which of the following is considered a better specimen for anaerobic culture than a swab?

Correct Answer
verified

What substances do organisms that use oxygen have to protect themselves from superoxide anions?

Correct Answer
verified

How are suspected colonies of anaerobes processed?

Correct Answer
verified

What organism mostly commonly causes gas gangrene?

Correct Answer
verified

How long are anaerobic cultures routinely held in the laboratory?

Correct Answer
verified

An immunosuppressed patient notices sinus tracts that are draining pus.He also notices that there appear to be small,hard "nuggets" in the pus.What disease will his doctor most likely diagnose?

Correct Answer
verified

Gram stains of specimens for anaerobic cultures should be examined for all the following reasons EXCEPT:

Correct Answer
verified

All of the following are approaches to treating anaerobic infections EXCEPT:

Correct Answer
verified

All of the following are non-spore-forming,anaerobic,gram-positive bacilli EXCEPT:

Correct Answer
verified

Exam 22: Anaerobes of Clinical Importance

What disease does Clostridium perfringens cause?

Correct AnswerverifiedShow Answer

Aerotolerant anaerobes include all the following EXCEPT:

Correct AnswerverifiedShow Answer

A microbiology technologist is reading an anaerobic culture and observes a double zone of hemolysis on an anaerobically incubated sheep blood agar plate.The Gram stain of that organism was a boxcar-shaped,gram-positive bacillus.What organism is this?

Correct AnswerverifiedShow Answer

What disk is used to presumptively identify Peptostreptococcus anaerobius?

Correct AnswerverifiedShow Answer

All of the following techniques are used for making definitive identification of anaerobes EXCEPT:

Correct AnswerverifiedShow Answer

Which of the following is considered a better specimen for anaerobic culture than a swab?

Correct AnswerverifiedShow Answer

What substances do organisms that use oxygen have to protect themselves from superoxide anions?

Correct AnswerverifiedShow Answer

How are suspected colonies of anaerobes processed?

Correct AnswerverifiedShow Answer

What organism mostly commonly causes gas gangrene?

Correct AnswerverifiedShow Answer

How long are anaerobic cultures routinely held in the laboratory?

Correct AnswerverifiedShow Answer

An immunosuppressed patient notices sinus tracts that are draining pus.He also notices that there appear to be small,hard "nuggets" in the pus.What disease will his doctor most likely diagnose?

Correct AnswerverifiedShow Answer

Gram stains of specimens for anaerobic cultures should be examined for all the following reasons EXCEPT:

Correct AnswerverifiedShow Answer

All of the following are approaches to treating anaerobic infections EXCEPT:

Correct AnswerverifiedShow Answer

All of the following are non-spore-forming,anaerobic,gram-positive bacilli EXCEPT:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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