Question 1

Which of the following agents lacks a cell wall and is the smallest known free-living form?

Accepted Answer

A)  Chlamydia 
B)  Mycoplasma 
C)  Rickettsia 
D)  Coxiella B

Question 2

Media that can be used for the isolation of Mycoplasma include:

Accepted Answer

A)  Thayer-Martin agar with vitamin K. 
B)  5% sheep blood and IsoVitaleX. 
C)  beef or soybean protein with serum and fresh yeast extract. 
D)  hemin and nicotinamide adenine dinucleotide (NA
D)  supplements. C

Question 3

The definitive identification of which of the following organisms is accomplished by hemadsorption techniques?

Accepted Answer

A)  Chlamydia trachomatis 
B)  Mycoplasma hominis 
C)  Mycoplasma pneumoniae 
D)  Mycoplasma genitalium C

Question 4

The natural habitat of Mycoplasma spp., which causes infectious disease in humans, can best be described as the:

Accepted Answer

A)  mucous membranes of humans. 
B)  aquatic environment. 
C)  natural environment. 
D)  genitourinary tract of animals.

Question 5

Caution should be taken when culturing blood in suspected cases of Mycoplasma infections since the organism is inhibited by which anticoagulant commonly found in commercial blood culture media?

Accepted Answer

A)  Ethylenediaminetetraacetic acid (EDT
A)  
B)  Sodium polyanethol sulfonate (SPS) 
C)  Heparin 
D)  Sodium citrate

Question 6

Which of the following Mycoplasma species is associated with individuals who are positive for human immunodeficiency virus (HIV), is capable of invading human cells, and can modulate the immune system?

Accepted Answer

A)  M. pneumoniae 
B)  M. genitalium 
C)  M. hominis 
D)  M. fermentans

Question 7

Incorporation of urea into media is used to enhance the detection of which organism?

Accepted Answer

A)  Ureaplasma urealyticum 
B)  Mycoplasma pneumonia 
C)  M. hominis 
D)  M. genitalium

Question 8

Quality control is set up to test urea agar.M.genitalium and M.hominis are used; however, both organisms are negative for urease activity.Which one of the following statements explains these findings?

Accepted Answer

A)  The urea agar is most likely expired. 
B)  The incubation time is most likely abbreviated. 
C)  A technical error has occurred. 
D)  These two organisms are poor choices for quality control of urea agar.

Question 9

The laboratory method of choice to identify Mycoplasma and Ureaplasma infections is:

Accepted Answer

A)  enzyme-linked immunosorbent assay (ELIS
A) . 
B)  direct fluorescent antibody (DF
A) . 
C)  latex agglutination. 
D)  real-time polymerase chain reaction (PCR).

Question 10

Which group of drugs is effective against Mycoplasma pneumoniae infections?

Accepted Answer

A)  Beta-lactams 
B)  Sulfonamides 
C)  Cephalosporins 
D)  Fluoroquinolones

Exam 44: Cell Walldeficient Bacteria: Mycoplasma and Ureaplasma